Oh, lately I've been using Gimp more, this was all drawn in Gimp
all you need to do is make a layer with base color in Gimp, and gradient fill it from say black to red like here
then Filters - Render - Patterns - Grid
customize it and there ya go
Gimp, hmmm... I had that once but I couldn't figure it out for the hell of me but I do admire those backgrounds you do. I might give it a shot, thanks ^^;
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