At the Game Architect blog, you’ll find a good looking paper model of a 15mm American Civil War wood and stone barns. The models are in black and white, so you’ll have to apply your own coloring.
barn
Rickety Barn Paper Model
Here’s a great paper model of an old rickety stone barn.
Tithe Barn Paper Model
Here’s a 1/160 paper model for the downloading. The Tithe Barn was built in Harrow in 1506 and still stands today.