Morlocks
/ Gene Nation

Callisto - McFarlane Toys Wetworks Assasin One hair on a Resaurus Virus Kelly Foster head on a Toybiz Previews Exclusive Mutant X Bloodstorm body with Toybiz Hercules Xena arms. Vest was chopped up from Toybiz Spiderman Blade figure. Knife came from scap bin.
Marrow - from the Toybiz Generation X Series 2, nicely (if you also mean gruesomely) sculpted!
Hemingway - custom figure I bought on ebay from seller and artist glenwebman69. Ever since pictures on the unproduced Hemingway from the cancelled Toybiz Generation X Series 3 came out, I was hoping to make one for myself. I can't imagine it would have turned out as nice as this one! He really packed in the details, professional-level sculpting and painting here. Here's a link to his custom gallery (on figurerealm.com). Besides more pictures of Hemingway, he has some great figures of the Great Lakes Avengers and the Mutant Liberation Front, among others.
I also have the unproduced prototype of Sack, another Gene Nation Member. He was to be a small pack-in figure with a detailed inner skeleton surrounded by a rubbery translucent outer skin.