I'm thinking of:

mWB
cBW
www

Where m is a nugget, c is a wool block, W is any block, B is any block and www is any wood.
I would then use the corresponding block texture, scaled as needed.

I would use the metal block relating to the nugget. I would use a scaled-down version of the wool (I want felt). I would use the scaled down (to a square on a board) version of the blocks for W and B. I would use the wood blocks for the base. Except for the base, where I'd use the appropriate parts of the texture (north side, wrapped around and the middle of down), I would use the up texture on each block. I intend to use the W abd B up textures for the pieces as well, but we're not there yet :D