Wein Krisztina, an IKEA Hacker from Budapest, yanked a wooden drawer from an old IKEA Moppe chest of drawers and turned it into a portable storage drawer to hold gadgets at her dining table. You can re-purpose this project to create an accessory drawer to your own storage-less desk.
All you need to do is make 45° cuts into two pieces of wood, then attach them together at a 90°angle. Screw this piece vertically onto the side of the drawer, and let it hang down from your desk top.
If you're interested in a uniform look, use an unfinished drawer and wood slats, then stain everything to match. If you're interested in getting started, check out more photos and detailed instructions at IKEA Hackers.
(Images: Wein Krisztina via IKEA Hackers)