I recently ordered an artbook from ConceptArt.org and it came with two tutorial downloads. One such, by Andrew Jones was focused on thumbnail design. It was really inspiring. I gave it a try this evening and while it is a more abstract creation method, I feel mine are more abstract than they ought to be. I do that a lot though, jump into a more advanced technique before spending the time on the fundamentals. I’m not caring much at this point, I’m having fun ^_^