MDF bases are a great choice for any table top miniatures or terrain. They are very smooth and have no texture, which makes them great for adding your own texture, or just painting. 

Compatible with Warhammer, Dungeons & Dragons, Pathfinder, Frostgrave, One Page Rules and all tabletop games.

These bases are laser-cut and are 3mm thick.

If you are looking for some other size that I don't have let me know.