I\'m currently trying to use AppCompat instead of ActionbarSherlock. On Android 4+ devices I don\'t run into any problems, as the normal Actionbar and Holo theme are used.
You have to create your own style with the image you want to put on background. In your style.xml, you should create something similar to this:
values/styles.xml
values-v14/styles.xml
and you can use this 9-patch image :