Ever wanted to see how it feels to go through one of those transporters on Star Trek? Stepping into the Illumination Shower might be as close as you can get right now. With a doughnut-shaped light above you emitting a cool glow while water cascades down upon you like rainfall, just close your eyes and you can easily imagine that you're beaming down with an away team to free Commander Riker from the Romulans. I've really gotta stop watching every NextGen rerun I come across.
The design ninjas at Japan's Spiritual Mode came up with the Illumination Shower; check out their site for more cool ideas for your facilities.