Thanks! When I started I quickly set default settings to 2 triangles, just linear variation as you suggest. But I never tried adding a third triangle! (I really didn't have a clue... ;o)

My default settings for the random batch are now 2-3 triangles, all variations, and I still don't add triangles, just push them around a bit.

I've only recently discovered the 'Mutations' window, and realized that it adds triangles.

So much to play with... (I originally wrote 'learn' but this is fun!)

 

P.S. I also recently downloaded Mandelbulber (having an extremely limited budget for all things hobby-wise means that I'm strangely drawn to free software!)

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).