There are good examples of paint color on the coop pages. The most popular seems to be red body with white trim, and it does look good. I went with a red, white and blue theme due to my stable (and city) name, but used a blue body color because that is the color I found in the mistake paint at Home Depot. I think a green body color, which is also popular, is real nice too.
I also like some of the brighter, creative color choices I have seen - check out babes-hideout, and a-real-chickenhause.
Alamogirl has a nice small one with pretty yellow and green colors.
If you want a nice classy looking beige, look at Mags2009.