
Colorful Abstract
create a new document (any size works)
fill it black
filter > render > difference clouds
duplicate this layer so you have about 4 copies (control J)
on each layer, image > adjust > hue / saturation
make sure the checkbox for colorize is checked, and make each layer a different color
(to keep the image from being to bright, move the saturation slider to the right, darkening the colors)
(I used 4 layers, colored red, green, blue, yellow from top to bottom)
set all the layers blending modes to difference
create a new layer on top of all the other layers
fill black, filter > render > difference clouds
filter > render > sketch > chrome (default settings)
set this layers blending mode to difference
your done