The most important thread of the century... We need to decide what block aesthetic we're going to use.
It's worth noting the plot server will start at 1.17.x so any 1.17 blocks are fair game to use. I'm happy to mix and match suggestions, so partial answers are okay as well.
1 - The top layer
2 - The Walls outside your plot underground
3 - The "Filling" of your plot
4 - The road surface
5 - Plot Border (One block for claimed, one for un-claimed)