'Roofing' Your Cubicle?

Alex Bischoff asks: "At work, I'm forced to suffer in my cubicle with overhead fluorescent lighting. So, I've given some thought to building a "roof" to block out that light, at which point I could use my own incandescent lighting to light the area (or perhaps an Eclipse Computer Light). Anyhow, at first I was going to just drape a sheet across the top of the cubible walls, and weigh them down somehow. But, after some thought, I'm thinking that might be too low, as the cubicle walls are only about five feet high (so would "stilts" for the sheet work?). So, has anyone built a 'cubicle roof' before? Any ideas on how to go about this?" Maybe a 'cubicle tent' would be more appropriate here? Especially for those cubicle warriors who are unusually tall.