A glowing cube! All the light in this scene is emanating from the cube. It is set on global radiosity with indirect lighting. The cube is set to be 100% luminous, and you make it glow by turning the gain on sky lighting way up to about 16-20. For an outdoor scene you have to turn the color of the sky down to black or it will totally wash out the image. This took 6 hrs to render at 640x 480. I used user settings to get the best result in the least time.