Block art: Creating mixed media art on wood

This block, which I had cut to order at Home Depot, is roughly 3x4 inches. It's similar in size to the artist trading card, which is 2.5 x 3.5 inches. I made this for a swap with one of my art group friends. I really like this substrate because the wood block allows you to go in-depth more than you would on a flat piece of paper. There are sides, a top, a bottom and a back to decorate. Plus, you can hammer and nail stuff into wood. Here's a starter photo, the near-finished piece, and the final version with all the embellishments:

The back, by the way, features my own hand-painted art tape (no need to by washi tape when you can make your own art tape!)