For those living in conventional housing but interested in adding a more natural feel, here’s an idea on how you can prime your space to accommodate earthen plaster. Here, Kyle illustrates “priming” plastic insulation so that it can receive finish plaster. It would also likely work on drywall, wood, metal, etc. Keep in mind that the bond probably won’t support a lot of weight, so you’ll want to keep subsequent coats / finishes fairly light. (I will probably keep the next layers under an inch total in most places.)
Update 1/30/17: The primer has continued to hold, and exceeds my expectations in performance. It’s remained on the wall everywhere, and hasn’t cracked at all. Will wait until spring before applying finish plaster, will report on how well that goes.