Harv,
I think it's a good thing you plan to put off the pins-in-blocks for a while. I can see a two year old falling onto a pin-in-a-block and hurting himself. On the other hand, a somewhat older kid could have a ball making thingies out of such materials.
Somewhere around here (looking around my rather cluttered office) I think I've got a collection of wooden geometric shapes. I used to have it anyway. It was used for teaching an aspect of inorganic chemistry, or group theory or something. Cubes, pyramids, icosahedra, dodecahedrons, etc. I bet you could figure a way to make some of those out of some walnut. They'd be fun to play with and just plain decorative, too.
Chuck