Below is the first batch of boards to have textures applied - you can see two joint compound buckets in the background. I estimate that I have used a third of a 5 gallon bucket of "mud." My bragging that I can do 100 paintings with one bucket might be conservative!
Since I have cutout and sanded 121 boards, I have a ways to go (70!). The textures are quite low relief - mostly between a 1/16" and 1/8". I'm sure that nowhere have I exceeded a thickness of 1/8".