One of the things Katie Cook offers at conventions are badge-size cards with tiny original sketches on them. When I stopped by to commission her in my new MLP:FiM mini-sketchbook, I found this one of Rainbow Dash waiting to be picked up.

I feel 20% cooler just owning it.

Drawn by Katie Cook during Detroit FanFare 2011.
"My Little Pony: Friendship is Magic" copyright Hasbro.