Here's a pic for an HL2 mod called Armageddon strain. Its based off of the Andromeda strain. I don't know if the people doing it will ever make it happen, but I thought I'd contribute anyway.
This is about 1 hour and 15 min into it. He's supposed to be running from someone. I thought I'd put the other guys hand in the rear of the frame. It would go along with an environment sketch showing both figures in mid chase.
The color one is a bit more rough. I still have a really hard time with color, so its a bit bland.