Very simply made from some cloudy plastic, black vinyl graphics, and poly styrene sheets.
The photo gallery shows the basic process. Here's a quick explaination.
Black vinyl Graphics are applied to 4 panels of semi-transparent plastic sheet. Those were
taped with clear tape to form a box, with the graphics facing outward. The top is made from 4 triangles of equal size, and are welded together with
viscous styrene glue made from Acrylic Cement. The bottom is made from a square piece of styrene, with 4 1/4" strips
glued vertically to hold the box in place.
After a coat of black spray paint(Krylon Fusion is the best for styrene out of a few kinds I've tried). I applied a silver adhesive film to the bottom and top pieces.
I used a basic Dial RGB LED Driver Board with a 3 watt RGB LED. There are no controls, a trim pot replaces the potetiometer/switch combo. And it was swichted to fade mode at the slowest setting. Powered by a small 5 volt PSU. The board, LED, and PSU were wired and hot glued to the bottom, on top of the reflective film. I made the cord extra long with a rotary on/off switch in-line with the cord.
The power cord is ran with the coat hanger out of the hole drilled in the top, large enough to allow the cord and coat hanger to be fit through. Then the coat hanger is bent into a hook, which I hung from decrotive black chain, left over from hanging a normal fixture.
The art is made for 5"x7.5" panels.
The graphics are availible for download. An .AI in Illustrator 10 and PDF are zipped together