Streets and curbs and some buildings carved from insulation foam. Other buildings from packaging materials. Often merged with other plastic bits or dio bits from Lil' Bratz or other lines.
About once per year I set up my ever growing city street scene on the ping pong table, and let my hero customs run wild. Batman always gets a run at things this way. These shots are some of my favorites. At different points you'll see the same core configuration used in a variety of settings, but usually tailored to the specific shots being set up at that time.
I have plans to use the underside of the street foam to carve in an old west street scene, but like most plans, do not yet have the time for them.