Personally I like this course, He uses dirt piles covered in a thin layer of concrete. If you go through their videos he talks about how he did it.
https://www.youtube.com/embed/Gh7pzdlwQw4
This is cool. I've been considering some lightweight concrete mixes, pearlite, styrofoam, I dunno Straw? Dyed, formed in some natural stone shapes, etc...
Making some terrain thats grippy, lightweight, and mounted as we've seen others do on a kind of modular platform. Something that can be mixed and matched, set at angles, with some kind of flexible connections so you can mix it up.
This video is the opposite of what I've been thinking, not ready for that kind of commitment. Though I was thinking I could extend the rock features around the pool, and kinda hide the intended purpose of all my newfound landscaping interest.
Right now though, I've got a knife, hot glue, a heat gun, and some EVA foam matting, see if I can come up with something for when its 110F and crawling out on the rocks seems more like atoning for past transgressions than a fun afternoon crawling or bashing.
But actually doing it properly and integrating some jagged terrain into some benches, a fire pit, bigger water features....
Anyone know roughly what the going rate is for concrete, pumped, per yard? Or is this some nutty "DYI" that involves extra help for home depot?