I picked up the recently released Mutants and Death Ray Guns from Ganesha Games. It's a real beer and pretzels Gamma World-style post-apocalypse game. Plus, it includes rules for something I have absolutely no figures for-- mutant plants. So, I had to whip some up.
They're almost trivial to make. I used the "twisted wire" method you often see suggested for making trees (you can find a description here, although that's way over the top). I used the rule of thumb from the Osprey Terrain Modelling book that you should cut 9 wires at 2.5x the length you want the tree to be. Fold the wires in half and twist them. The "eye" where you bent them becomes the roots (after you cut the eye open) and the other end becomes the branches. After posing, I covered the armature with floral tape, and coated that with Elmer's/PVA glue to set it. When I epoxied the tree to a metal washer, I also used epoxy to cover up any big holes I had missed. I then sculpted a face onto the tree using green stuff.
After painting, I used Woodland Scenics Hob-E-Tac to adhere WS foliage of various types (I found that clump foliage, my favorite, once again looked best-- the brown trunk with green foliage). After drying a day, I sealed them extremely well to try and keep the foliage on.
I have made figures matching some plants I rolled up...a Big plant that causes Terror, two Humanoid plants, and one plant that fronts an '80s big hair tribute band.