[Android Themes] evilisto:
WP7(Mango?) app switcher is like this :

and i made similar thing by modifying ics app switcher layout.

preview :

[YOUTUBE]Eo82jtW_0kA[/YOUTUBE]

flashable mod is originally posted in nexus s theme forum.

[MOD] Change ICS App Switcher to Windows Phone 7 Style

this mod is related to framework-res.apk and SystemUI.apk so making universal version for any devices is difficult. so i write this simple guide for other rom / device users. :)

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* framework-res.apk

- /res/values/dimens.xml : change thumbnail size to..

<dimen name="thumbnail_height">305.0dip</dimen>
<dimen name="thumbnail_width">192.0dip</dimen>

these values are wvga devices only. if you have mdpi or xhdpi device, you have to adjust these values suitable to your screen size.

* SystemUI.apk

- /res/values/bools.xml

<bool name="config_recents_thumbnail_image_fits_to_xy">true</bool>

- /res/values/drawables.xml

<item type="drawable" name="status_bar_recents_background_solid">#ff33b1e1</item>

- /res/layout/status_bar_no_recent_apps.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout android:background="@drawable/status_bar_recents_background_solid" android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:textSize="20.0dip" android:textColor="@color/status_bar_recents_app_label_color" android:gravity="center_horizontal" android:layout_gravity="center" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/status_bar_no_recent_apps" />
</FrameLayout>

- /res/layout-port/status_bar_recent_item.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout android:paddingLeft="@dimen/status_bar_recents_item_padding" android:paddingRight="@dimen/status_bar_recents_item_padding" android:layout_width="wrap_content" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout android:layout_gravity="center_vertical" android:id="@id/recent_item" android:paddingTop="@android:dimen/status_bar_height" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true">
<FrameLayout android:id="@id/app_thumbnail" android:background="@drawable/recents_thumbnail_bg" android:visibility="invisible" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5.0dip" android:foreground="@drawable/recents_thumbnail_fg" android:layout_centerInParent="true">
<ImageView android:id="@id/app_thumbnail_image" android:layout_width="192.0dip" android:layout_height="305.0dip" />
<ImageView android:id="@id/app_icon" android:visibility="gone" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="@dimen/status_bar_recents_app_icon_left_margin" android:layout_marginTop="0.0dip" android:scaleType="centerInside" android:adjustViewBounds="true" android:maxWidth="@dimen/status_bar_recents_app_icon_max_width" android:maxHeight="@dimen/status_bar_recents_app_icon_max_height" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" />
</FrameLayout>
<TextView android:textSize="@dimen/status_bar_recents_app_label_text_size" android:textColor="@color/status_bar_recents_app_label_color" android:ellipsize="marquee" android:id="@id/app_label" android:paddingTop="0.0dip" android:fadingEdge="horizontal" android:fadingEdgeLength="@dimen/status_bar_recents_fading_edge_length" android:layout_width="@dimen/status_bar_recents_app_label_width" android:layout_height="fill_parent" android:layout_marginLeft="@dimen/status_bar_recents_app_label_left_margin" android:layout_marginTop="100.0dip" android:scrollHorizontally="true" android:singleLine="true" android:layout_below="@id/app_thumbnail" android:layout_alignLeft="@id/app_thumbnail" android:layout_alignParentBottom="true" />
<TextView android:textSize="@dimen/status_bar_recents_app_description_text_size" android:ellipsize="marquee" android:id="@id/app_description" android:fadingEdge="horizontal" android:fadingEdgeLength="@dimen/status_bar_recents_fading_edge_length" android:layout_width="@dimen/status_bar_recents_app_label_width" android:layout_height="wrap_content" android:layout_marginLeft="@dimen/status_bar_recents_app_label_left_margin" android:layout_marginTop="40.0dip" android:scrollHorizontally="true" android:singleLine="true" android:layout_below="@id/app_label" android:layout_alignLeft="@id/app_thumbnail" android:layout_alignParentBottom="true" />
</RelativeLayout>
</FrameLayout>

- /res/layout-port/status_bar_recent_panel.xml

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.recent.RecentsPanelView android:id="@id/recents_root" android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<FrameLayout android:id="@id/recents_bg_protect" android:background="@drawable/status_bar_recents_background_solid" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_centerVertical="true">
<com.android.systemui.recent.RecentsHorizontalScrollView android:layout_gravity="bottom|left|center" android:id="@id/recents_container" android:scrollbars="none" android:fadingEdge="none" android:fadingEdgeLength="0.0dip" android:clipChildren="false" android:clipToPadding="false" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginRight="0.0dip" android:stackFromBottom="true" android:divider="@null">
<LinearLayout android:orientation="horizontal" android:id="@id/recents_linear_layout" android:clipChildren="false" android:clipToPadding="false" android:layout_width="fill_parent" android:layout_height="wrap_content" />
</com.android.systemui.recent.RecentsHorizontalScrollView>
</FrameLayout>
<include android:id="@id/recents_no_apps" android:visibility="invisible" android:layout_width="fill_parent" android:layout_height="fill_parent" layout="@layout/status_bar_no_recent_apps" />
</com.android.systemui.recent.RecentsPanelView>

and you'd better to edit landscape layout too..

- /res/layout-land/status_bar_recent_item.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout android:paddingLeft="@dimen/status_bar_recents_item_padding" android:paddingRight="@dimen/status_bar_recents_item_padding" android:layout_width="wrap_content" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout android:layout_gravity="center_vertical" android:id="@id/recent_item" android:paddingTop="@android:dimen/status_bar_height" android:layout_width="wrap_content" android:layout_height="wrap_content">
<FrameLayout android:id="@id/app_thumbnail" android:background="@drawable/recents_thumbnail_bg" android:visibility="invisible" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="@dimen/status_bar_recents_thumbnail_left_margin" android:layout_marginTop="@dimen/status_bar_recents_thumbnail_top_margin" android:foreground="@drawable/recents_thumbnail_fg" android:layout_alignParentLeft="true" android:layout_alignParentTop="true">
<ImageView android:id="@id/app_thumbnail_image" android:layout_width="115.0dip" android:layout_height="183.0dip" />
</FrameLayout>
<ImageView android:id="@id/app_icon" android:visibility="gone" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="@dimen/status_bar_recents_app_icon_left_margin" android:layout_marginTop="@dimen/status_bar_recents_app_icon_top_margin" android:scaleType="centerInside" android:adjustViewBounds="true" android:maxWidth="@dimen/status_bar_recents_app_icon_max_width" android:maxHeight="@dimen/status_bar_recents_app_icon_max_height" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" />
<TextView android:textSize="@dimen/status_bar_recents_app_label_text_size" android:textColor="@color/status_bar_recents_app_label_color" android:ellipsize="marquee" android:id="@id/app_label" android:fadingEdge="horizontal" android:fadingEdgeLength="@dimen/status_bar_recents_fading_edge_length" android:layout_width="@dimen/status_bar_recents_app_label_width" android:layout_height="wrap_content" android:layout_marginLeft="@dimen/status_bar_recents_app_label_left_margin" android:layout_marginTop="@dimen/status_bar_recents_text_description_padding" android:scrollHorizontally="true" android:singleLine="true" android:layout_below="@id/app_thumbnail" android:layout_alignLeft="@id/app_thumbnail" />
<TextView android:textSize="@dimen/status_bar_recents_app_description_text_size" android:ellipsize="marquee" android:id="@id/app_description" android:fadingEdge="horizontal" android:fadingEdgeLength="@dimen/status_bar_recents_fading_edge_length" android:layout_width="@dimen/status_bar_recents_app_label_width" android:layout_height="wrap_content" android:layout_marginTop="@dimen/status_bar_recents_text_description_padding" android:scrollHorizontally="true" android:singleLine="true" android:layout_below="@id/app_label" android:layout_alignLeft="@id/app_thumbnail" />
</RelativeLayout>
</FrameLayout>

- /res/layout-land/status_bar_recent_panel.xml

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.recent.RecentsPanelView android:id="@id/recents_root" android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<FrameLayout android:id="@id/recents_bg_protect" android:background="@drawable/status_bar_recents_background" android:clipChildren="false" android:clipToPadding="false" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentBottom="true">
<com.android.systemui.recent.RecentsHorizontalScrollView android:layout_gravity="bottom|left|center" android:orientation="horizontal" android:id="@id/recents_container" android:scrollbars="none" android:fadingEdge="none" android:fadingEdgeLength="0.0dip" android:clipChildren="false" android:clipToPadding="false" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_marginRight="@dimen/status_bar_recents_right_glow_margin" android:stackFromBottom="true" android:divider="@null">
<LinearLayout android:orientation="horizontal" android:id="@id/recents_linear_layout" android:clipChildren="false" android:clipToPadding="false" android:layout_width="wrap_content" android:layout_height="fill_parent" />
</com.android.systemui.recent.RecentsHorizontalScrollView>
</FrameLayout>
<include android:id="@id/recents_no_apps" android:visibility="invisible" android:layout_width="fill_parent" android:layout_height="fill_parent" layout="@layout/status_bar_no_recent_apps" />
</com.android.systemui.recent.RecentsPanelView>

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Thanks to brucekey in rootzwiki

(this mod is based on his WEBAOKP mod.)

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