If you are a hermit crab, your home is whatever you find for your shell. Artist Aki Inomata makes 3D printed shells for hermit crabs to set up their homesteads inside of. These shells have little buildings and cityscapes on top.
I know that you can use LEGOs to build almost anything, but I didn’t think that other species on Earth thought the same as us humans. Check out Harry, the hermit crab, who decided that a shell made out of LEGOs was perfectly fine to serve as his home.