This is an easy way to make your own $50+ value mood light with a minimum of parts/effort/Cost and electrical or electronic experience. Even soldering can be avoided!.
Total cost could be as little as $2.
Step 1: The heart of the mood lamp
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.
Step 2: The cover/display
The easy/cheaper option first. Find a suitable plastic vase or Glass - it should be about 200 mm tall (5 or 6 inches) at least and translucent that is you can see light through when you look through it but not see through clearly. In the UK we call this frosted.
A 2 AA cell battery holder and a matching battery clip - you can buy or steal one off a dead PP3 9 volt battery.
And of course the rainbow LED (or more than one if you like).