Forest Downpour

While this isn't an incredible piece, it's a beautiful proof-of-concept.
My new trick: Gradient Difference.
If you take the gradient preset of red, blue, and yellow, and you set the mode (at the top) to Difference, you can use it repeatedly over itself for a wild little multicolor effect. If you take that effect and cycle the colors with H/S/L (ctrl or cmd+U) or with Levels... (ctrl or cmd+L), there's lots of exploration to be done. This one was made by a layer of verticals set to difference mode and 50% opacity laid on another random one colorized green. I like it, though it's nothing incredible.