I loved the rust paint I did the dragon with that I set off for the same manufacturer's copper/verdigris treatment. Also very, very nifty.
While I was at it, I did some stuff with various paints on some gaming scenery (an OpenForge gatehouse):
And a new dice tower:
It'd be fun to print out a bunch more of the OpenForge scenery for actual gaming use, but since my system of choice uses hexagons instead of squares, that might get a bit awkward.