I've seen others suggest ground texture options for housing, lusher grass, lava rock etc. I just had another thought along that line so I wanted to add it--fallen leaves. It could be possibly versatile for different yard themes. A big huge color changing maple as tall as the house would be lovely too, especially if we can jump on/climb branches. FC members tend to enjoy jumping around and we occasionally make a sort of obstacle course to gain access to the balcony.