Check out this awesome piece of Ghostbusters fan art. It's called "Something Strange In Your Neighborhood," and it was created by Rob Loukotka. I'm a huge fan of Ghostbusters, and this is one of the coolest pieces of fan art I think I've ever seen. Here's what the artist had to say about it:
I tried to capture the tone of the movie in this illustration, specifically the sequence where you see them running all over the city busting ghosts. They’re jaded, tired, blue-collar workers halfway through the movie. So I tried to show Dr. Venkman’s apathy to whole situation by lighting up a cigarette and ignoring the ghost bustin’. Obviously this is not a shot from the movie, but more of a fabricated scenario that I like to imagine happened at some point.
The poster costs $40, and you can purchase it here.