This is a way, to make a crazy multicoloured background... i dont quite know what you could use it for though.
1. Make a new image, ours is 400 x 400 - with a white background
2. Grab the gradient tool, from the tool bar, and give it these settings at the top:
3. With your gradient tool, click and drag your cursor from the very top left, to the bottom right.
5. Now, on the mode bar at the top, set set the mode to "difference"
6. Now, juts go crazy on your canvas, dragging rather selections all different kinds of ways! do this about 15 times in total.... maybe more or less. (Tip, dont do very small lines)
Your done! i dont have anyhting else to say :)
More Tutorials: 
