I am putting a UX knol together describing how to change the default highlights per every view and control. Tabs and few other view/controls have different ones which is why its not up yet. It is a better solution than trying to switch stuff base don build string to match he underlying OS UI highlights in that you will be able to have the UI highlights of the application match the UI of your application.
Another UX knol that I am working on is how to use the NinePatch editor tool. Thus, they should be up by late tonight or early Wed morning. I still have not decided if this should be a theme series, but since I use themes to implement it maybe it should be should be the Android Theme Knol article series.