Teeth whitening treatment at home. Put a tiny bit of toothpaste into a small cup, mix in one teaspoon baking soda plus one teaspoon of hydrogen peroxide, and half a teaspoon water. Thoroughly mix then brush your teeth for two minutes.
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.