I've already been working on an idea for a city map. Been on the back burner for about a month though. Going to be my first with all custom textures. Very aware of the jetpack issues, and hopefully my ideas for balancing that will work. Nothing new to me in this thread.
Xabiar, I'm still in the process of learning a lot of this stuff myself. The tools aren't that hard to learn. Now if you lack in artistic skill, oh well, but you could still flesh out the base structure for others to work on. Besides, once you get started you might find talent you never knew you had. All you really did in this post is say, "hey, make a city map". No help at all. Go make something, even if it sucks, you are being productive.