Autodesk's 123D Creature is an iPad app that lets you design a monster and then order a 3D print for home delivery. The app costs $2 and I just bought it. Looking forward to trying it out with Jane tonight!
Create a skeleton
Add joints and create limbs to build up your 3D character in digital clay. Reposition, pose, and scale limbs; and adjust your creature's shape.
Add surface details using the sculpting tools, then use the airbrush to paint on color or use image paint add realistic details by to rubbing areas of a photo onto your 3D creature.
Export and share
Bring your 3D creature into the render room to generate amazing images to share with your friends. Use the in-app printing service to order a 3D print of your creature, or export your 3D model complete with textures.
(Via Adafruit Industries)