I've released "Plastik", a Snow Leopard-only traffic lights pack.
For Snow Leopard (including dark-window apps like QuickTime, Pixelmator and FaceTime):
fav.me/d4hdkijFor iTunes:
fav.me/d4hgfx9Also, I've updated my Lion traffic lights for Snow Leopard, now with iTunes compatibility!
Go get 'em now:
fav.me/d3hsv1w