Well, I couldn't resist. I made a set of moonlights by way of these plans. I also used the LDS's from Radio Shack. The lights I used are the 5mm Blue LED pn 276-316. The wavelength was a little lower than recommended, but I think they look cool anyway. The resistors are 100's instead of 150's, either way they worked fine. I used a adjustable power supply that varies from 3volts to 15volts DC. I have it set at 6 volts and it has a nice glow to it. You can set it to 4.5 to dim it. I will post pictures tomorrow.
On top of that, this is in my 29gal FW tank.
http://www.kaotica.com/frag/diy/moonlight/