I spent a couple of hours the other night taking pics of some wood that I have in the shop and then photo shopping, cutting & trimming.... etc... so I can have a file to add in to my sketchup materials. Just right click and save down to your directories - if you so desire.
Most of the wood is still in a rough cut - unplaned state - but I tried to get good representation of the grain & coloring. Works well inside of sketchup....
African Mahogany
Ambrosia Maple
Bird's Eye Maple
Bloodwood
Bubinga