Back in the days before the internet and before I had a color printer (heck, I still don't have one...) I would design cities using a brush in MacPaint that would create a square grid, like graph paper.
Then, I would use a set of colored markers to color in the legend on the left. I'd use that legend to color in squares within the cities to suggest where businesses and other "types" of areas were located within the cities.
Here's a colored map of two large cities in Queston, Korum and Manticorn. Enjoy!
Heck, get out your markers and make your own!