I think it would be really cool to see in the future some kind of way for community builder to have your main profile picture link to a bigger one or a lightbox with a bigger version. You know, just like facebook! (Facebook is not the only one that does this). Here is a great example of what I'm talking about:
www.summitpost.org/users/josh-lewis/67750
(ok in this example it brings you to a gallery which you can get the bigger picture, but you get the idea)

I think many of us would like this feature added.