I love the way working with a doll house that's homemade brings out the creativity in children.
My daughter has made two items lately, totally by herself and not by my urging. First, a crib/playpen. It's made from a box that contained soap. The legs are tall wooden beads. It is trimmed in ribbon and rick-rack.
And a shower. The shower is pieced together from all sorts of things: a clear plastic box that contained who-knows-what, old ribbon, old lightweight wood left over from an airplane kit, and of course a condiment container. She even used a foam sticker as a no-slip pad in the tub.
Just have fun!