Star Ranger has this advice for basing your starship models. There are lessons to be learned here for players of Battlefleet Gothic, Full Thrust, Star Fleet battles, and other science fiction miniature wargames.
City Walls Paper Model
Wizards of the Coast has this free 25mm – 28mm wargames model of Intact and Ruined City Walls.
Rules By Ral variant
The Jackson Gamers present their Medieval version of the venerable Rules by Ral.
Paper Medieval Cottages
Wizards of the Coast has this 25mm – 28mm papermodel of a medieval cottage. You could print out a whole bunch of these and have a whole village for your miniature wargames skirmishes.
The True Cost of Gaming
Mikko Kurki-Suonio at Small Cuts has an article about the true (economic) costs of miniature wargaming.