Here is a fun (and yes, messy) printing project. 
All you need is a muffin tin, table covering to protect your table, a smock to protect your child's clothing, paints & brushes, and paper cut into squares about 4" x 4" in size.

Directions:
* cover your table to protect it's surface
* child should wear a smock to protect their clothing
* place a muffin tin face down on the table
* paint the surface of the muffin tin with different colors
* press the pieces of paper onto the painted tin then lift off to see the
pretty print
* let the pieces of paper dry, then place them side by side to see all the
lovely prints
* EXTRA: you can then use these prints to create a collage