"CG" that stands for crittergarden - which I'm tired of typing out each time
A 6 foot conical shape covered with semps and sedums could look so cool, and at that height you really could put larger things on the bottom!
Here is an unedited photo of the semp vertical wall that motivated me to do my own project, this wall is 5x4 feet or so. Being winter its not looking great, also the people have just left it alone so there are some bare spots, but it was/is a good reminder of how something may look after a couple of years as things spread and die back...just something else to keep in mind when planning (I could go crazy with planning!!)
