I just bought a 5 metre roll of RGB LED's - after reading this Jeelabs article. I even bought the necessary MOSfet transistors to build the driver board.

But then I came across this story - and I happen to have a BlinkM MaxM laying around

Using MaxM with flexible RGB tape
A single BlinkM MaxM can easily drive a 5 meter (16 ft) roll of the flexible RGB SMD LED tape that’s used for architectural lighting. Each roll contains 150 RGB LEDs.

Each LED in the tape is a SMD RGB "5050" LED, capable of putting out about 6000mcd. The spacing between LEDs is 3.3cm (~1.25").

Every 3 LEDs is a cut mark with solder tabs so you can cut or join pieces of tape.

Max current for a 5m roll is about 1.9 Amps. I did a quick test of MaxM driving three rolls at about 6A and it seemed fine.

[From Using MaxM with flexible RGB tape « todbot blog]

So now I will have to try this out tonight (after it gets dark).

Btw. these are made to be driven from a 12v source - and the MaxM blaster board will have to be powered from the external source barrel connector, as the board apparently can take 12V, and as a strip can draw up to 1.9 amps it will require a decent power supply.