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Duct Tape Mannequin
You could add a little concrete dye to your batch of concrete to give it something other than a gray look. This way you don't have to wait before painting it. It will already be colored.
DIY Indoor Outdoor concrete lamp 2
Introduction to Mold Making & Casting
Mold Making & Casting Class
LEDs and Lighting Class
Would be a decent vehicle for a prepper. Could be stocked up with emergency supplies and whatever you want for a SHTF scenario. Biggest exception would be the EMP type situation which would fry the computers. But for anything else would be fairly good option.