I love finding and testing tutorials to see if some ideas can be drawn from them and used in different scenarios. Sometimes I will revisit older tutorials to see if I "missed" anything. Then I had to repay Fractal Explorer a visit because my initial exploration of it didn't go deep enough. And I found that right smack in the middle of our GIMP is a truly under-utilized gem, in Fractal Explorer (File - Render). It's GUI driven, you can see what you're doing, and you can make some truly awesome designs with very little effort.
Take my quick little image here, I titled it Angel Wars, for a current project I am working on for a local band's CD cover. The cover image involves demons and angels fighting in the heavens, I needed something to highlight that scenario.

This is only a rough draft because I intend to refine it, darken it, and make it fit the backdrop better. But the great thing is, I was able to save my FE preset for later use to tweak it further, later on. We can even share these presets as text files.
I was truly amazed at how unique this little plug-in really is. I've managed to create alien landscapes and space scenes with relative ease.
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"In order to attain the impossible, one must attempt the absurd."
~ Miguel de Cervantes