Odd color or not, people are finding the cheap UFO camping lights pretty useful. You can't beat $5 dollars shipped I guess. So remember the idea of using Halogen shop lights from here? http://cheesycam.com/diy-halogen-shop-light-mod/
Here's another one that might get the hamster wheels in your heads spinning. Cheesycam reader Pawel writes in and links me to some inexpensive outdoor high power LED flood lights. These LED flood lights are designed to take abuse with a weatherproof housing and come with a positionable mounting bracket. The bracket should make it real easy to mount to a traditional light stand. Available in 10W [might be too little] - all they way up to more than 100W, there's plenty of light power to go around. These are commonly used to light up parking lots, street lamps, and buildings. I'm finding that the higher power lights go to a more bluish temp, while the lower 10-20W LED Flood lights are a warmer tone around 3200-3500K (about Tungsten). Around 65W is said to have a 5600K color temp.
A further search even shows that these lights are available in both AC power and 12V DC and some listings show a 160 degree beam angle. That's pretty wide. 12V DC would be pretty nice to run right off battery power at remote locations. Keep in mind that these high power LEDs will still generate a little bit of heat, but nothing compared to what Halogens would be putting out. I'm in on this idea and maybe i'll check my local hardware stores to see if they have any on hand. Oh and if you're the colorful type, somewhere i've also seen that they make color changing versions.. Another idea for color changing backgrounds..
Some additional search results for High Power LED Lighting below: