In any case, I'm always on the lookout for websites that sort of simulate this. I posted one about storybird recently: http://storybird.com/
I've now found a new website that allows students to use a variety of comic-style backgrounds and thought bubbles to create and publish a story called makebeliefscomix.com.
It takes a little clicking and dragging, but it's pretty self-explanatory. I plan to put it on the SmartBoard and play around with it next week to introduce it to students, and then add it to my Literacy Center choices.