When I got into the hobby of building custom figures, particularly building custom Green Lantern Corps figures, I had three goals:
First, to create figures for Green Lanterns I liked that had never gotten decent figures (G'Nort, Salaak),
second, to even out the gender disparity in my Green Lantern Corps, owing to the lack of female figures put out (Soranik Natu, Arisia),
and third, my final goal was to make my Green Lantern Corps less human (and humanoid)-centric. The Green Lantern Corps are picked from the best of representatives of countless species from across the cosmos, and I wanted my collection to reflect that, so I started buying up non-human figures to convert to that end. I'd had my eye on the Ben 10 figures for a while, since the creature designs are pretty cool, and the scale is about right. The Ben 10 logo could be replaced with a Green Lantern logo pretty naturally too, and since Ben 10 is pretty much just a Dial H For Hero rip-off anyway, it seemed like a perfect fit.

Anyway, a month or two back I was at a flea market and they had a bunch of beat up old toys being sold for cheap, so I grabbed a handful of Ben 10 figures and a Pokemon figure that looked interesting, and threw them in my pile of projects to eventually work on. Anyway, I decided it was about time to get to it, so I started with Brainstorm. This custom is mostly just a repaint with a few tweaks. Apparently the Brainstorm figure came with some sort of removable brain inside of it, as when I picked up mine, there was an empty brain-shaped cavity under the hood. Although I wasn't planning on having my Green Lantern going around showing off his brain, I was going to fully disassemble him for painting anyway, so I sanded down the rim of the brainpan and flipped it the other way, so that the brain indentation was convex rather than concave, giving the look of a brain in his head, as opposed to the lack of one. After that I sculpted on a Green Lantern ring using Magic Sculpt. After that, all the rest was just repainting facial features that had worn off and repainting the body. I painted him to look as the standard Green Lantern uniform might look on a member of his species, plus a white belt, as Guy Gardner would have, since I thought that was a pretty good look.

Beware Brin St'rm, Green Lantern of Sector 16!