You have them. We all do. Old, dried out markers. Someone either forgot to put the caps back on or they've been used in a particularly fervent coloring session. Whatever the cause, the next time you go to clean out the art supplies, keep the dried out markers and save some money.
The brilliant Missa Katie of Artopotamus came up with the idea of making her own watercolors using old markers. Once you gather enough of the same color, simply soak markers in water until you get the desired color. You'll have to tinker with the water to marker ratio to get it the way you like it. When you're done just bottle the colored water up and you've got homemade watercolors. For more details about this money-saving tip as well as other great art ideas, check out her blog Artopotamus.
(Image: Missa Katie)