10 minute work here. Quick step by step: triangle brush, rectangle brush, random brush dynamics (preset), motion blur, lense flare, black to white gradient for light, plasma layer for color and structure.
Simple but meh, I haven't shared (or made) anything for quite a while, so here you go.
Link: http://arzoroc.deviantart.com/art/Abstr ... -318945941
Btw, just shot some photos with my phone, so maybe I'll get back into Gimp a bit. I'm pretty damn rusty at the moment