I would like to know, if I can get the background that is displayed when using android’s holo theme, as a drawable? (you know, the dark black and blue background that is displayed for 3.0+) I need to use it as a drawable, so if someone knows if this can be done, please let me know..

Sorry, but I forgot to mention that this is displayed on a tablet device, not sure about phones.
If it is possible, your best bet is to look in the android .jar for 3.0 (which can be downloaded using ADT in Eclipse)
The image may be found in /drawable/drawable-hdpi or possibly somewhere within /drawable
If not, it likely is only possible to find in the source.