I think whether it's too girly will depend entirely on the guy. As someone who is only a few years out of college, I wouldn't have been surprised to see this in a dorm. Particularly for a metrosexual guy! The fratty guys were very into pink a few years ago, and I've definitely seen that teal color in mens clothing lately.
That said, there are still a lot of "macho" guys out there who might find the teal + the swirly print to be a little girly. That's why I like solid colors for men's quilts - unless it's camo or sports team print, any print can give it a slightly girly feel.
So, it all depends on the DGS. See what his mom says!