Ok the interfacelift was the one that I remember seeing, but the other ones are pretty sweet too.
I tried to change my Dashboard icon, but I'm a little confused.

I followed the steps and it says to cut and paste the new icon over the old one. But when I do this, it just changes the icon in the finder, and not actually in my dock. It's probably something very simple but I've only had my MBP for about a week so I'm still learning things.