i have decided to set a challenge for myself: one of the dungeon or building interior generators in this should be basically out of the box cellular automata (it's fine to postprocess to a limited extent). one candidate rule:
[[0,1,0,0,0],
[0,0,2,0,0],
[2,1,2,0,0],
[1,2,2,1,0],
[1,1,1,2,2]]