The only way to really revamp your mac theme is through a haxy called Shapeshifter. Right now its not really supported by leopard (only some themes in beta, others not working at all) but here's the link anyway, in case they update it in the near future.http://unsanity.com/haxies/shapeshifter
Warning though, this may fuck up your computer, as it's a haxy. Well, it's popular, so in conclusion I wouldn't really mind trusting this.
Sig figs suck.