Good ol' hand outlines

What we used:

pen or pencil
paper
markers or crayons

What we did:
I intended to do turkeys (yes I know Thanksgiving is long over) but the boys thought it was just fun to color in the hands. So we outlined their hands and they colored them in. Pretty easy, and amazingly kept them occupied for almost an hour! That's a successful craft in my book =)

One of the finished products:

Glue "stencils"

What we used:

paper
glue
pencil (we used a pencil, I don't recommend that)
crayons with the wrapper taken off (we found this to work better than the pencil)

What we did:
Use the glue to make shapes and words on one piece of paper. Let dry. Place another piece of paper over it and rub the crayons (laying flat on their side) all over. The shapes from the glue stencils will show on the top paper.
Sorry, didn't get a good picture of the finished product but here is a picture of the craft in action, before we changed to crayons =)

Colorful sketches

What we used:

paper
crayons-black and other random colors
or markers for the colors
paper clip

What we did:
First make a rainbow type design with different color crayons (but we discovered that markers actually work better)

Then cover the colors with black crayon. Press hard and cover up the colors as much as possible. Unfold a paper clip and use it to draw a design. The paper clip will scrape away the black to reveal the colors underneath.
I used to do this as a kid and thought it was great. The boys thought so too!