Melissa's art supply organization tip seems magical to me. I'm not sure why this hack works, but it sure is pretty.
Trying to keep the art supplies from devolving into chaos seems like a constant struggle around here. We recently reorganized our kids' art supplies, and I discovered that once I sorted all the markers and crayons by color family, the kids instinctively maintain the system without any prompting from me. (It's been a month, now, and though the markers have been used daily, not a single one is out of place!)
I used various boxes with dividers (Ikea has some nice plastic ones with removable dividers) and sorted the markers into blue/green, pink/purple, red/yellow/orange and black/brown/gray.
I also notice a lot less arguing over the markers now that they can easily see that their neighbor doesn't have the only blue/pink/favorite-color-of-the-moment marker. My 3-year-old loves to sort things by color, so he spends more time making sure the crayons are in order than actually coloring!
Good use for an old silverware drawer organizer, which you could pick up second-hand for almost nothing.
Any more crayon/marker organizing brainstorms?
Related: Never lose a marker cap again