Everyday I scour the internet for a Nice Envato style webcomic template. Perhaps something like this http://pvponline.com/comic/2014/07/31/cons-and-pros where users can upload there comics and display them in a nice gallery with Previous and next buttons.
Just a thought
There are some things that could be made so easily with any theme that making it, for instance the comic theme idea you have, would just be a gimmick. There are a lot of themes here with user-submittable capabilities and MANY plugins for the same thing – why re-invent the wheel?