Spotted recently in rooms both indoor and outdoor: canvas teepees, which create a distinctive private play space.
To acquire your own, consider the Children's Backyard Tipi from Reliable Tent & Tipi, which comes in outdoor and indoor versions starting at $189, or the Natural Canvas Teepee from HearthSong for $359.
Above: An urban child's room, via Brooklyn Modern.
Above: A teepee in the English countryside at Stella Manor.
Above: A three-year-old's bedroom, featured in a previous post: Designer Visit: San Anselmo Bungalow by Jute Interior Design.
Above: A child's room spotted in Living Etc.
N.B.: This post is an update; the original story ran on March 10, 2009.