These will be cool to have, and like the vast majority of commercial ventures, their success will depend on how much you charge for them...or if you can make them truly unique, that the novelty of ownership will entice purchases (niche market).
I could get into Inkscape (free downloadable program) and spend less than 5 minutes creating an SVG file to send to then email to a local laser cutter to have very similar items made from MDF or Plywood for fairly cheap, or spend a little extra cash and have them cut in acrylic, as many as I like.
So if you can keep your costs below that, then you will likely sell some...if you're not married to the idea of wood, then Worktroll's suggestion of casts would be a good idea for the stated reason, although I'd go with resin rather than plaster.