Another Google find-- a custom from the Figure Realm board. Here's the creator's comments:
Another member of the ever-growing Black Lantern Corps, Martian Manhunter. This one took quite awhile to get going. No matter what head I looked at I was never satisfied until I saw someone on here use a Savage Dragon head. So I used the same, sanding down the top of the head and substituting the bottom of his face with part of Taskmaster's jaw. Some additional sculpting and painting and his visage was complete.
The body came from one of the DCU Supermans (the blue one I believe) since in the comic he mentions how everyone forgets he is as strong as Superman, I thought it was an appropriate choice for a base. Switched the hands for the long claws of Lizard from the Spiderman classics line. Made an alternate hand for him from an extra Brood tentacle. Sculpted his chest emblem, wristbands, and other minor details followed by a complete paint job. Cape was made from a Black Panther cape with heavy modifications.
Now he's ready to give Green Lantern and Flash a whooping!
StEvOtoys actually has three pictures on display here, including the aforementioned shot of Black Lantern J'Onn J'Onzz strangling the Scarlet Speedster with a tentacle arm. Check it out! Also, I've got Black Lantern Ralph Didny up at the Justice League Detroit blog, which must be seen to be believed (two words-- translucent drool.)