Tegan Sideshow of Modest House is at Home Expo 2011 and has brought some really cute prefabs. I've always really enjoyed Tegan's work -- her textures tend to be so soft, and I really like that. Also, her designs are usually a little outside the norm, in a really good way - she frequently surprises me with her floor plans and little architectural details. PLUS, most of her houses are pretty small and cozy, and that's my favorite way to go!
Some of my favorites from the Modest House display at Expo:
The Boho House
The Launay House
The Ames House (my most favorite!)
Visit Modest House at Home Expo [SLurl]