I have no idea about the themes, however if "everything" is bitmaps how do they scale the buttons etc according to packing ?

Edit: Looking at theme maker it indeed looks like everything is done in bitmaps, so I guess the next thing is to figure how to bypass the theme and supply my own bitmaps (I could probably live with re-using the call-end and answer button backgound styles from the theme too, but how to do that ?)