I want evil gnomes with red eyes and BLUE!!! skin. If they ain't blue, they ain't Kobolds. That's where the name of the mineral and color come from, dag nabbit! But D&D has never done them right, and I don't expect they ever will.
I think hands-down the best artist out there for humanoid monsters is Mike Wilson (http://www.mikewilsonart.com/).
Here are his kobolds: