OK, so my vote for the coolest looking Half Life 2 mod has to go to Black Mesa, which is, ironically, a HL2 mod to make it look like... wait for it.... HL1! Sure you can get the "Half Life: Source" program with HL2, which puts the HL2 textures into the HL1 game, but it doesn't put any of the new physics, character models, etc.... gosh wouldn't that be cool huh? (This is in fact, what I said the first time I played it).

Well, looks like this is it.