One of the best ways I know to add some real visual interest to any room in your home is to throw your house a curve. Instead of the usual right-angle joint between walls, build in a nice, gentle arc. The basic procedure is pretty simple. Cut a pair of curved top and bottom plates out of 3/4-inch plywood. Fasten these to the floor and ceiling, then nail in a series of ordinary studs between them, and then cover them with drywall.