Those of you who make your own environments, pieces or props, what is your favourite? Or which one do you remember most?

For me, my favourite so far has to be my city centre / street set. I really like setting stories in urban environments. Most everything (pavements, buildings, etc) was made of cardboard, with print outs for wall and concrete textures. Tried and tested, sure, but was memorable for the fact that I really had to plan everything, which I am usually very bad at.