An icon set to extend Lions default icins, Does anyone know of an icon set that he's the same blue icons as are standard in Lion, yet with extended meaning? 

E.g. a folder with a pacman figure (to denote a games folder) on front.
I don't know of a pre-built set out there for you, but there's a nifty app on the Mac App Store called "Folders Factory" that makes it very easy to make customized folders.  Just drop in your pacman image and it'll create a folder and allow you to tweak settings, placement, colors, etc.