Random Procedureal Images as streets...
My daughter was googling about for images of trees (for a school project) and bumped into a site that ended up catching my attention.
Specifically this gallery of work, entitled Substrate. Now the whole site is cool, but these images (to my eye) looked like street diagrams! (Just click on the "small" "medium" or "large" links to render a random image in your browser.)
The neat thing is, these were generated with Processing which I actually have some experience with (and is even installed on my computer!) and is a really cool piece of software for programatically working with graphics (and can generate java applets for use on the web).
So now I have to download the Substrate code and play with it to see if I can get it to generate nice street pattern as a starting point for city maps....
(I also love the colour palette used!)