DLTK's Preschool Crafts for Kids
Three Dimensional Paper Models Index

Paper models are most complicated crafts on the DLTK websites, but they are fairly simple examples of paper models in general. They provide a good introduction to the fun and time consuming hobby of paper modeling and are suitable for children ages 10+ for the most part.

The 3D hanging versions are the simplest types and are suitable for ages 5+.

3D Hanging Crafts (Age 4+)

Cone Santa Claus