www.dockulicious.com. If their application doesn't work, you can use Candybar, or better still directly replace the files in question (instructions are usually there in each dock theme you download). You can also do customisations by means of some awesome icons (check michaelsmac.com, deviantart and other icon resources for some stunning stuff)
@BBThumbhealer: Wally is still not complete yet. Needs a few things done...