well for the more expensive kind you have this:

http://cgi.ebay.com/GMP-PORKCHOPS-P...1QQcmdZViewItem

GMP PORKCHOP'S PORK CHOP HOUSE DOG DIORAMA DIECAST 1:18

also the turtles sewer hq (I can't remember the real name) has been used for gijoes (its a tad off scale but not noticably)

21st Century Toys Ultimate Soldier City Fountain Playset, Normandy Farmhouse and Bombed French Building comes to mind as well

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