Katie Cook's DeviantArt gallery is full of adorable Star Wars sketch cards she created for the Topps Star Wars 30th Anniversary trading card set (she draws an irresistible Chewbacca, but Garindan's my favorite). You can see more of her work at her sketch blog, and contact her here to request a commission.
(I have no interest in the regular cards in the set, and don't care about having a one of a kind. Please Mr. Lucas, stop selling sets that only help Ebay speculators. Sell a book with all of the sketch card designs.)