After diligently pouring over the Tutorials & How To's, and after hours of experimentation, I STILL cannot build a decent volcano with GIMP. I'm trying to get a nice, conical, textured island-type (think Oahu or Hawaiʻi - the island, not the whole state ) - but with no luck as of yet. The only tut I found resembles pools of lava flowing down into other pools of lava; geologically interesting, but not quite what I'm after. I have the image in my head (have been up close and personnel with several that are typical for the type I'm after), but can't translate that image to the software.
Any direction would be greatly appreciated.