The stock art space is, perhaps ironically, anything but boring. Carlyle recently jumped into the game with its acquisition of Getty, and Pond5, a startup that pledges to provide a better deal to artists, recently closed a big round from venture capital investors including Accel Partners. And then, there's Shutterstock, a hot IPO from late 2012 that has been generating big returns on regular beats for public investors. Today's Chart of the Day is up nearly 40 percent over the last 12 months, but some have to wonder if stock art is peaking on public markets. Elsewhere, that looks to be the case.