The image here was created in about 6 seconds, on this website. This website is basically a giant fancy dynamic glowing pen tool with different symmetry and color options. Playing around in it a bit, you can create a variety of fun, pretty, glowy picture.

I haven’t researched anything about it beyond the website itself, but from what I can tell, it records your mouse position as you drag along the black background, and while the mouse is down, it adds specific coordinates to a list that are randomly offset from the mouse position, while at the same time adding extra coordinates for rendering, depending on speed. You notice, if you move the mouse faster, the waves that are drawn get bigger and wider.