easy disco lights... Paint a box black and cut out a 'window' area. For the window use plastic light diffusing panels made for suspended ceiling lights (available at hardware stores, usually several different patters/textures available). Tape the window plastic to the inside of the box and then tape strings of Christmas light around the inside of the box. Put some strings on steady on and some on blinking and close up the box.
Dreams don't work unless you do.