The heart of the mood lamp is the colour changing light. Bright LEd systems driven by complex microprocessor systems are detailed elsewhere in instructables but this uses a commercial easily available colour changing LED from www.Rapidonline.co.uk if you are in the Uk or search fro colour changing LED or rainbow LED in Ebay or google for your country i am sure you can find them. Here they are £0.56 or so each.
The LED contains a red - Blue - Green LED and a minute microprocessor inside a standard 5mm LED package - IT IS SMALL. All you need is to apply 3 volts to the LED to make it work.
Enjoy.
I just used some scraps from with windows installation. 5 RGB LED's (From eBay) and a plexiglass pencil holder.
Depending on your junk box :-) the design can be easily changed.
different flash or change rates.
I thought I would need to sand it but turns out when unsanded the mood light stays enven better!
For the base I used cardbord and wrapped in tin foil so the cardboard don't fall apart.
Just know there are kind of three different types of RGB's you'll run into. Slow blink. Fast Blink, (IMO really annoying) and Slow than Fast (Still annoying.)
Also you'll probably want to find RBG's in the 5000mcd (brightness) range. Beware of 2200mcd's and such as they are pretty dim.
Here is a video of a simpler lamp using the same LED. - (sorry for the audio).
and some pictures showing the simplicity of its construction.