Just loaded gimp and started playing

That's way cool!

very nice - looks like an old arcade game/the first tron movie

is that a gradient inside a selection ?

he4rty: that's cool! something about it reminds me of the "draccidental" patterns.

It started with a black layer then I used the blend tool set on difference, gradient full colour spectrum and linear pattern, then blended left to right, top to bottom and repeated. played with the curves.