This genius idea just seems too simple. Create a pen caddy with toilet paper rolls and an old shoe box! Or, use them to organize those pesky cords. ( this page isn't found but I think you get the idea )
Craft supply organization ideas with a printer tray. I don't have a craft supply. But if I did, I would organize it with a printer tray. And even though I don't I can think of tons of ways to use this -- office supplies, jewelry, makeup, and on and on!