Customizer miniBIGS has designed and is currently selling this Green Lantern minifigure. I'm guessing this is Hal Jordan after his rebirth and infection by Parallax.
With Warner Brothers releasing a new film on June 17th, 2011 starring Ryan Reynolds, there's always the possibility of a LEGO Green Lantern line. I could see it being a mash-up of LEGO Space and Batman themes. I could also see a whole series of vehicle sets in trans-green bricks; constructs of Hal Jordan's power ring.
Here's to hoping someone out there is working on an entire mini-Corps and the many hued lanterns; red, orange, yellow, blue...
(Via miniBIGS Flickr stream)