I'd really appreciate a flag print brick, perhaps a 4x2 and a 6x4 version. They would be thinner than a regular brick and could possibly have extra vertices so undulo paint would cause the flag to wave more realistically. Actually making the prints won't be necessary, I can do that.
I'm having trouble with the exporter, otherwise I would do it myself. I have a .blend file of the mesh if someone would like it, but the materials aren't set up properly.