Flickr: More detail about Water Colours
I created this by setting my camera on the hood of my car and driving really fast at my house that has blue and green Christmas lights. When I got close, I slammed on the brakes and my camera flew off the hood and I used my remote to capture the above image...
But seriously, it's a lava-lamp-like thing in a dark room; and I shook the camera up and down real fast.