Ellie Goulding’s awesome song that is Lights now has an interactive site for it. You guide a fizzling spark over a landscape coloured and shaped by the music akin to something from Audiosurf.
The more you keep your mouse button held down the faster the spark moves along.
You can check it out here: Interactive Lights
My only complaint however is that they didn’t use (or offer a version with) the Bassnectar remix of the track.
Via the awesomeness that is Nomad.