These colorful, perforated window decorations can really brighten up a room when sunlight shows through all the pinholes.
To create one, simply cut a sun shape out of the paper or card stock and place it atop the cardboard.

Have your child pierce the paper with the pushpin, creating a pattern of straight lines or swirls.
Loop a piece of string or thread through one of the holes near the top edge of the sun catcher, and it's ready to hang.