Walking back from lunch today, we saw a couple of guys finishing up the paint job on this new Denver Water street ad/art, the latest in their "Use Only What You Need Campaign." Located right in front of the Market Street Station on the 16th Street Mall, let's hope it gets lots of eyes—despite some epic snow and rainfall this year, Colorado is facing a major future water shortage, as we pointed out in our 2010 story on water in the west.