However, the Half-Life Cartoon Model Pack is not.
Simply download the pack (as referenced by the link below), rename it to pak1.pak, and stick it in your Half-Life/Valve directory. You should notice a beautiful difference then.
It modifies all ingame NPC/enemy models to look, you know, cartoony. Big eyes, exaggerated features, and smooth gradients. I like the Barney one especially.
Download. Or. Die. Instructions are included. Oh yes.
I am unable to support this pack, but if you want more of my creative, non-Half-Life talents, then get your ass over to Japanese For Crustaceans. It's a funny romantic comic.
Thank you, and GAWD BLESS.