Still on the Hunt
I have not forgotten about the reader's request to find a rug similar to this vibrantly colored one used by Steven Gambrel. In fact, I'm still searching. Although it looks very contemporary -- very Rug Company -- there are antique Tibetan designs that resemble it.
Image is from Elle Decor's September 2001 feature, "Yankee Hip."
Update: A big thanks to The Ornamentalist for pointing me to this Tibetan rug available through Inner Asia Rugs. (Look at the symbolic designs under Gangchen.)