Germ’s World has a large collection of paper models for wargames in 6mm scale. These would be useful for, say a BattleTech game, or maybe Epic 40k. There are hangars, moon bases, factories, space docks and middle east buildings.
6mm
Converting 25mm Paper Figures To 6mm Paper Figures
Squirmydad has a tutorial on converting 25mm paper figures to 6mm paper figures suitable for mounting on pennies. He superimposes the original figures on a colored circle that can be folded and glued to pennies. Using Photoshop, he shows you how to adjust the DPI, scale, and add the background and base. It’s very good, and I’m going to try the same thing in Corel PhotoPaint.
6mm Wargaming Site
The 6mm Wargaming site is a nice general site on the scale.
Making Barbed Wire For 6mm Scale Figures
The Wargaming Site Blog has a nice photo tutorial on making barbed wire emplacements for 6mm wargames figures.