This idea just slipped my mind and I was sure that something like this had been done before.
I searched via Google and found those 2 examples
http://en.wikipedia.org/wiki/Charcoal_(comics)
http://timesync.gmu.edu/libnews/?p=6020
Could somebody provide more examples (if there are any)?
Plus: Do you think there's any chance of this happening again anytime soon?
Would you participate?
And what would your character be like?
How would it integrate into the Marvel Universe?