I've always liked Magnetos purple and red costume, it's so ridiculous for a man planning to rule the world... and yet it always looked really cool - the studs on his shoulders, holes in his gloves and boots and that spikey helmet, so silly yet sooooo cool.
So I tried rendering him out in a realistic manner using 3DSMax and Photoshop - here was the result:

I think he looks great, I certainly wouldn't mess with him.
The Green Lantern is a character I've been getting back into recently - before all the 'Blackest Night' and Green Lantern movie stuff kicked off - I liked the idea of an interplanetary police force staffed by a variety of aliens, I'm a sci-fi fan at heart, after all!
Here's the Green Lantern in a realistic style:

I think these characters hold up really well when interpreted literally into a realistic style, if only Hollywood thought the same. They could always use me to develop projects for them ;)
EDIT:
I take some of that back - some films stay faithful to their source, cases in point: Superman (1978), Batman Begins (2005), Spider Man (2002) and Iron Man (2007) - some of the best and most fun superhero films I've seen (and they're all called ---man, weird).