[Captivate Themes and Apps] DemonWav:
There are a few things to look for to get the look that you want.

in /res/values/styles.xml depending on what you have for this set of xml determines which .png's the framework is using:

<style name="Theme.IconMenu" parent="@style/Theme">
<item name="windowAnimationStyle">@style/Animation.OptionsPanel</item>
<item name="background">@null</item>
<item name="itemTextAppearance">@style/TextAppearance.Widget.IconMenu.Item</item>
<item name="horizontalDivider">@drawable/divider_horizontal_bright</item>
<item name="verticalDivider">@drawable/divider_vertical_bright</item>
<item name="itemBackground">@drawable/menu_selector</item>
<item name="itemIconDisabledAlpha">?disabledAlpha</item>
<item name="moreIcon">@drawable/ic_menu_more</item>
</style>

but if you are using an existing theme that is darker then the chances are it will be something like this:

<style name="Theme.IconMenu" parent="@style/Theme">
<item name="windowAnimationStyle">@style/Animation.OptionsPanel</item>
<item name="background">@null</item>
<item name="itemTextAppearance">@style/TextAppearance.Widget.IconMenu.Item</item>
<item name="horizontalDivider">@drawable/divider_horizontal_dark</item>
<item name="verticalDivider">@drawable/divider_vertical_dark</item>
<item name="itemBackground">@drawable/menu_selector</item>
<item name="itemIconDisabledAlpha">?disabledAlpha</item>
<item name="moreIcon">@drawable/ic_menu_more</item>
</style>

Now with that said, if it is using the first case, you will be looking for files named "divider_horizontal_bright.9.png" and "divider_vertical_bright.9.png". They are .9.png's so deal with them accordingly. Now if you have the second case then you are going to look for "divider_horizontal_dark.9.png" and "divider_vertical_dark.9.png".

Edit those to get your desired effect, but those are only the dividers of the menu.

Now I'm going to go back over the xml to show you what I'm looking at.

<item name="horizontalDivider">[COLOR="Blue"]@drawable/divider_horizontal_bright[/COLOR]</item>
<item name="verticalDivider">[COLOR="Blue"]@drawable/divider_vertical_bright[/COLOR]</item>

<item name="horizontalDivider">[COLOR="Red"]@drawable/divider_horizontal_dark[/COLOR]</item>
<item name="verticalDivider">[COLOR="Red"]@drawable/divider_vertical_dark[/COLOR]</item>

Those two items determine which .png the framework is looking at, and using that will tell you what to look for when you are editing your theme.

Now lets look at a much more rather obscure portion of the xml, but it still tells you where to look. Under "<style name="Theme">" near the beginning of the styles.xml, there is a long list of items pointing to different .png's in the framework. The one we are interested in is:

<item name="panelBackground">[COLOR="Purple"]@drawable/menu_background[/COLOR]</item>
<item name="panelFullBackground">[COLOR="Purple"]@drawable/menu_background_fill_parent_width[/COLOR]</item>

This tells you what to look for to edit the background of the menu, and the "top" horizontal bar if you want one.

So look for "menu_background.9.png" and "menu_background_fill_parent_width.9.png". Edit them to have the same look, because the "menu_background_fill_parent_width.9.png" is what you get when you press the menu button, and the "menu_background.9.png" is what you get when you press the "more" button. Again, these are .9.png's so edit them accordingly. If you have any more questions, please ask! I tried to make this as clear as I possibly could.