I'd love to see something like this as well for contacts, but here's something similar that was posted that you may want to look into to make somethings black, also includes a new sliding bar thing to answer your phone, and a sliding bar thing to block buttons when on calls as to not be touching anything with your ear or anything. Little known bugs, but you can read and see it for yourself here, I'm currently using it and love it;
http://forum.ppcgeeks.com/showthread.php?t=51295