I'm really getting into the FF at the moment. A while ago I purchased Mark Millar and Bryan Hitch's entire run on the title and more recently my other half (my girlfriend, not my conjoined twin) bought me Mark Waid and Mike Wieringo's run as a birthday present. Waid and 'Ringo's FF stuff really is as good as everyone says it is. In one story (spoiler alert) the Thing is killed and so Reed Richards builds a machine that can traverse the afterlife in order to go and rescue his friend. I love the idea that for Reed, Heaven is just another unexplored plain of reality for his family to explore, just like the Negative Zone or the Microverse. As if that wasn't brilliant enough, the FF meet God! And he's Jack Kirby! Brilliant stuff.
Anyhoo, it inspired me to tit around on Photoshop again. If you want to see far more successful Photoshop/comic cover shenanigans then check out The Brave and the Bold: The Lost Issues. You'll see far better stuff there than my meager efforts.
(UPDATE/CORRECTION 10/7/12: Ross, the brains behind The Brave and the Bold: The Lost Issues does all of his work on that blog with MS Paint not Photoshop. That's very impressive! And it's all fun stuff, so check it out.)
Before you go however, take a moment to reflect on how cool this comic would be if it were real.