Forget those glow in the dark stars that stick to your bedroom ceiling. If you really want to dress up a room, check out the Laser Star Projector. Using a combination of green laser and blue diodes, the Laser Star Projector projects green stars and a blue universal haze on any wall or ceiling in the house.
Throughout the night (or day if your room is really dark), the blue clouds and green stars morph and change to different positions, which means you have an ever changing universe within your reach. The only drawback is the projector doesn't display real constellations, but really, when was the last time you looked up and said, "Hey look, it's Camelopardalis!" The Laser Star Projector sells for $200.
Via Think Geek