Thanks for the ideas, everyone.
While artificial grass would be low maintenance & would look good all the time, since it's plastic its supposed to get very hot when in direct sun & that area gets alot of sun & yes, it will take 1000 years to decompose plus it's the most expensive option.
At the moment I'm aiming towards putting rocks around the perimeter with pavers in the center area - possibly with some smaller rocks between them just to break it up a bit. Sandi, I like the idea of various sizes of planters. I won't change them out much but I'm sure the varying sizes will look nice. And while I could plant a tree or plants in the ground, I am concerned about things getting too big so large pots might help to keep them under control.
I really appreciate your thoughts on this. When I get it done, I'll post pics - just don't hold your breathe. I move slowly when I don't know what I'm doing.