Stuttgart-based designer Wolfram Kampffmeyer creates DIY geometric paper sculpture kits under the name Paperwolf. The designs range from taxidermy trophies to standalone animals that come flat-packed with detailed instructions on how to fold and assemble yourself. See tons of additional designs in his Etsy shop. (via Endless Geyser of Awesome, Bored Panda)
Update: Several Paperwolf creature kits are now available in the Colossal Shop.