I got asked by a friend one day to help refurb a set of 4 bubble lamps which only glowed white so i happily  accepted and this is how we went about it.  I wish i had taken more picture at the time but this is all i have below but i will try and describe what we did to pimp these lights.

First problem i seen was that the power system was really bad because the bubble lamps where basically shop bought 240VAC lamps bodged into a limo, somone in all their original genius thought  they would use a 150W inverter to boost the 12VDC car battery up to 240VAC and then plugged in the wall adapter which dropped it back 12VAC for the aquarium pump and lamp. so in an attempt to increase safety and efficiency i made a quick 555 IC circuit tuned to around 50hz which worked like a charm pumping the bubbles. The RGB LEDs where controlled by an atmega8 that just run a couple of loops and had some beefy Mosfets connected to allow them to control a lot of lights at any one time but less talk more pictures.