They're just kind of models to show what they look like. I initially wanted to put Billy in a cowboy "YEE-HAW!" pose, but effed it up pretty badly and decided I needed to first figure out how to draw him at all, and then go on to any kind of pose.
Much as I like the comic, I swear the guy at Ctrl+Alt+Del uses sprite sheets for the characters.
Where are these lemmings going? The
Super Nintendo Super Shire! Hop in line and follow them there!