[Samsung Epic 4G Touch] dtm_stretch:
Nope, unfortunately so much was changed between gingerbread and ICS. That guide points to res/layout/keyguard_screen_tab_unlock.xml as controlling the background and color....well color and background are only even mentioned in the ICS xml in regards to the clock.

<?xml version="1.0" encoding="utf-8"?>
<GridLayout android:gravity="center_horizontal" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<com.android.internal.widget.DigitalClock android:layout_gravity="right" android:id="@id/time" android:layout_marginTop="@dimen/keyguard_lockscreen_status_line_clockfont_top_margin" android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin" android:layout_marginBottom="12.0dip">
<TextView android:textAppearance="?textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_clock_font_size" android:textColor="@color/lockscreen_clock_background" android:ellipsize="none" android:id="@id/timeDisplayBackground" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="6.0dip" android:singleLine="true" />
<TextView android:textAppearance="?textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_clock_font_size" android:textColor="@color/lockscreen_clock_foreground" android:ellipsize="none" android:id="@id/timeDisplayForeground" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="6.0dip" android:singleLine="true" android:layout_alignLeft="@id/timeDisplayBackground" android:layout_alignTop="@id/timeDisplayBackground" />
</com.android.internal.widget.DigitalClock>
<LinearLayout android:layout_gravity="right" android:orientation="horizontal" android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin">
<TextView android:textAppearance="?textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:ellipsize="marquee" android:id="@id/date" android:layout_width="wrap_content" android:layout_height="wrap_content" android:singleLine="true" />
<TextView android:textAppearance="?textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:ellipsize="marquee" android:id="@id/alarm_status" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="16.0dip" android:singleLine="true" android:drawablePadding="4.0dip" />
</LinearLayout>
<TextView android:textAppearance="?textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:ellipsize="marquee" android:layout_gravity="right" android:id="@id/status1" android:layout_marginRight="@dimen/keyguard_lockscreen_status_line_font_right_margin" android:singleLine="true" android:drawablePadding="4.0dip" />
<Space android:layout_gravity="fill" />
<Button android:layout_gravity="right" android:id="@id/emergencyCallButton" android:visibility="gone" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="4.0dip" android:layout_marginRight="16.0dip" android:text="@string/lockscreen_emergency_call" android:drawableLeft="@drawable/lockscreen_emergency_button" android:drawablePadding="4.0dip" style="?android:attr/buttonBarButtonStyle" />
<RelativeLayout android:layout_width="fill_parent" android:layout_height="302.0dip">
<com.android.internal.widget.multiwaveview.MultiWaveView android:orientation="horizontal" android:id="@id/unlock_widget" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentBottom="true" android:targetDescriptions="@array/lockscreen_target_descriptions_with_camera" android:directionDescriptions="@array/lockscreen_direction_descriptions" android:targetDrawables="@array/lockscreen_targets_with_camera" android:handleDrawable="@drawable/ic_lockscreen_handle" android:rightChevronDrawable="@drawable/ic_lockscreen_chevron_right" android:waveDrawable="@drawable/ic_lockscreen_outerring" android:outerRadius="@dimen/multiwaveview_target_placement_radius" android:hitRadius="@dimen/multiwaveview_hit_radius" android:vibrationDuration="20" android:snapMargin="@dimen/multiwaveview_snap_margin" android:feedbackCount="3" android:verticalOffset="60.0dip" android:horizontalOffset="0.0dip" />
<TextView android:textAppearance="?textAppearanceMedium" android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:textColor="?textColorSecondary" android:ellipsize="marquee" android:gravity="center_horizontal" android:id="@id/carrier" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="12.0dip" android:singleLine="true" android:layout_alignParentBottom="true" />
<TextView android:textAppearance="?textAppearanceMedium" android:ellipsize="marquee" android:id="@id/statement" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="12.0dip" android:singleLine="true" android:drawablePadding="4.0dip" android:layout_below="@id/carrier" android:layout_centerHorizontal="true" android:marqueeRepeatLimit="marquee_forever" />
</RelativeLayout>
<LinearLayout android:gravity="center" android:orientation="horizontal" android:layout_width="fill_parent" android:weightSum="2.0" style="?android:attr/buttonBarStyle">
<Button android:textSize="@dimen/keyguard_lockscreen_status_line_font_size" android:layout_gravity="center_horizontal" android:id="@id/emergencyCallButton" android:visibility="gone" android:layout_width="0.0dip" android:layout_height="wrap_content" android:text="@string/lockscreen_emergency_call" android:drawableLeft="@drawable/lockscreen_emergency_button" android:drawablePadding="0.0dip" android:layout_weight="1.0" style="?android:attr/buttonBarButtonStyle" />
</LinearLayout>
<include android:layout_gravity="fill" android:id="@id/transport" android:layout_width="0.0dip" android:layout_height="0.0dip" android:layout_column="0" android:layout_row="0" android:layout_rowSpan="4" android:layout_columnSpan="1" layout="@layout/keyguard_transport_control" />
</GridLayout>

This xml res/layout/zzz_keyguard_screen_lockscreenwallpaper.xml isn't even there anymore

I need to find the xml that controls the slide unlock and I have searched just about everywhere.