When I think of downtown Minneapolis and the urban city life, one of the first things that comes to mind is graffiti. Graffiti has always been an art form that I have found interesting and, even though I know it's illegal to do on public property, I have a great deal of admiration for people that are talented enough to create these pieces of work.
Some see graffiti as a symbol of vandalism and a form of urban decay, while others believe some of this art should belong in museums. Modern day graffiti began in the early 60s in Philadelphia when artists like Cornbread and Cool Earl etched their names all over the city of brotherly love.
(nymag.com)
Different terminology indicates different types of graffiti. For example, a tag is a personal signature usually done with spraypaint:

A bomb is when the artist basically tries marking as many surfaces as possible. In the 70s, it was popular for graffiti artists in New York to travel to each of the 5 boroughs to leave their mark.
And, finally, a piece is a term used for graffiti that took a long time to create, is complex, and is often drawn in sketch books and practiced ahead of time.

(urbandictionary.com)
Several websites exist for downloading type faces that resemble graffiti as graphic designers try to get a more urban and youthful feel to some of their work. These sites include dafont.com and graffitifonts.net (two of my personal favorites).

Keep your eyes peeled! You never know when you'll see a tag or a piece just walking downtown! Some places of business are even allowing taggers to throw up their art work on their buildings. There's a great example of this on Hennepin Avenue where an artist has done a piece that says COMMUNITY.