I made this in Blender. I used a 20x subdivided plain with two displacement modifiers and an orthographic camera to make this background along with 4 different colored planes acting as light sources. With a few adjustments to the scene, the background can be used as a cool sky background, or something similar, which can be seen in a render I uploaded previously. The image is smaller than it's native 1920x1080 resolution because of the size constraints of this website.
