Now this is a truly happy home. Interior designer Kerrie L. Kelly teamed up with Pulte Homes to create a treehouse made of metal, foam and wood that was raffled off to benefit the Child Abuse Prevention Council of Placer County, near Sacramento, California. "The house sold for $36,000, with all of the proceeds benefitting the charity," says Kelly. "Meanwhile, one lucky kid had the structure reinstalled in their very own backyard. The entrance is a ladder, and the exit is a slide that comes out of the side of the tree into the softscape below."