This is a simple idea to make your tv and place more alive:
All you need from materials are in the images...
The leds are attached with build in adhesive tape(see images)
Te power supply is rated at 10 amps 12 volts to work lightly and not overloaded(6 amps over the leds).
There are a lot of low cost kits on ebay...
You can have a look here:
Estimating cost: 25 euro
Estimating time : one afternoon and a geek coffee!
p.s.: please check out my campaign for the arduino project on indiegogo and share if you liked it: