I approve and infact I've done ONE of these, though my artistic skills aren't exactly the greatest and getting an actual noticeable difference in my style is alittle tricky.
http://tehninjabunneh.deviantart.com...hange-47613515
One also walks a thin line between noticeable differences and offensive. I need to do another one of these sometime. I think my skills have improved considerably since then (though still not that great :P).