Pushpins on foamboard. Trace your design first, buy twice as many pins as you think you'll need. If framing, cut foam board to frame first. - Cute way to use the push pins I bought for my DIY headboard and didn't end up using.
Wallpaper an old spice rack to use for nail polish. LOVE THIS IDEA! Now I need to find an old spice rack and some cool wallpaper :-) Fun craft to do when I'm avoiding grading papers or doing work for grad classes.
Bowls made of confetti! Great recycling art project--save all those leftover paper scraps (put in small bowls at each table). Collect a bunch and have the kids cut them up; Then make bowls made from confetti.