Here's two more ideas I got off pinterest. The first is this fingerprint tree.
So then I saw this digi kit on Jessica Spragues "one buck Wednesday" (completely forgetting that this pin had a link to a free one) and thought the tree was perfect for this and it was $1!! So I printed it out to fill an 8.5x11 piece of paper and printed it on card stock. I had the girls choose which color stamp the wanted and told them they could only use that color so when looking at it you knew who's little prints were who's.
The 2nd project is this Halloween garland. I printed it in black ink (just the outline) on black cardstock. Because printers don't print in white:) But the black showed up enough for Emily to cut this out. She wanted it above my bed.