Today in my Internet wanderings, I came across this lovely method from the Lazy Forger for making streets and sidewalks, using MDF.
Here are the relevant three parts:
1. Carving the cast lines and cracks
2. Sponge Painting
3. Sidewalks and detailing
I think that this technique could be combined with my eventual plan to make a 6 foot square 28mm City fight board, by having an MDF layer to represent roadways, and indeed it may be adaptable to blue foam as well. Since I own a table saw, making the relevant cuts should be simple.
Something to think about in the future.
Also, a warm welcome to Sean Robson, who like many excellent folks, is a paleontologist. He also has a great blog mostly aimed at D&D, and has come up with a very handy format to present adventures, which I hope to utilize when I get around to finalizing the one I am working on for New Years.