I saw this idea recently on No Time For Flashcards. This was a really easy holiday craft for the 4th of July. I just cut a piece of blue cardstock in half, one piece for each boy. Then I squirted red and white acrylic paint onto 2 paper plates, added a star cookie cutter for each color, and let them make star prints. Easy peasy!!
And here's how they turned out. Pretty neat, huh?