Sifting through my desktop's 2B_Blogged folder, I came across this link to an article that was posted on Boing Boing a while back. The post introduced me to a blog site called Covered, where cartoonists redraw comic covers in their own style.
The results are quite interesting... definitely worth a visit! Go and check it out at http://coveredblog.blogspot.com/ - enjoy! Perhaps you'll be inspired to attempt your own 'cover of a cover'? ;)