Try Litko's BaseMaker™ tool. Choose to have your base made from any of 20 different materials. You can even get special features like rounded corners on your bases.
These bases are wonderful! I, myself like the look and feel of the thick ones, and being bare wood, I can stain them with whatever base color I wish, and glue my figures to the base, not to a coat of paint! All I use is a permanent marker for the staining, to boot!
Thanks!