I've found the following site very useful:

http://sleague.apolyton.net/index.ph...ry:Civ2_Cities

It has a bunch of city, town, and terrain icons made for Civilization 2 scenarios that look quite good on maps. It probably wouldn't be a good idea to use them on professional for-profit projects, but otherwise the Civ2 community is pretty good about being willing to share work if properly credited.

There are also some terrain and other icons on that site some people might find useful.