Epic level Halloween costuming, functional mechanical skeletal hand. Best visual instructions of the concept here: http://www.bitrebels.com/geek/how-to-make-your-own-gigantic-steampunk-mechanical-hand/ Thermoplastic found here: www.amazon.com/dp/B01E2YTZ2S
Tutorial for making "leather" vambraces out of craft foam. This is EXACTLY what I was thinking of while I was watching leather-work cosplay tutorials, "I wonder if I could just do that with foamboard..."
DIY for making of antlers by Jolien-Rosanne. Starting with a base of iron wire covered in foam. Then carved the foam into shape covered it with light weight clay (L'Artista clay). After sanding fine tuning I covered the entire thing in worbla to give it strength. Weighs a fraction of real antlers.