Cryptic (Camouflage) - tries to blend in with the surrounding area/environment.
Hognose, rattlers, rough green, some rat snakes, pine snakes, etc...

Disruptive - tries to use the surrounding area to blend in by breaking up their pattern making the snake look less visible, eyes on the tail or things like that.
Pythons, boas, gaboon vipers, etc...

Aposematic - tries to stand out so you WILL SEE IT.
Coral snakes, gray banded king, milks, scarlet, etc...