Is there any for .596 or can you use the themes for previous versions?
[THEME] Black, White, and Chrome for GB v4.5.596 - Android Forums
Just be sure you're deodexed before flashing. I thing Bo has a deodexing zip in that thread, If not, he's got one for 596 somewhere on that site.
2 cents in a world that gives a penny for my thoughts.