My graphic designer daughter introduced me to Archie Archambault's work and his "Maps from the Mind". Now, whereas you're not going to use these to necessarily find your way to the parking lot of a baseball stadium, they are kind of interesting and appear to be somewhat geographically accurate (and pretty good for getting a feel of spatial relationships between neighborhoods).
Take a look and see what you think.
Here is his initial list of cities (I would imagine he intends to expand the list as long as the demand exists):
Amsterdam (perhaps where some of the creativity for this idea came from )