Have you seen the Tinkercad scribble beta?

Scribbling your Mom will love! 

The scribble beta is a new tool that has been added to TinkerCAD. It is super slick and fun at the same time. Essentially you have a brush that you can drag wherever you wish. When you let go it is automatically turned into a 3D version of it. Check out this tutorial where I create a nifty Detroit Lions key chain in less than 5 minutes.