I usually celebrate my own team's goals with a drink of water, scrape crease snow into my net, and then just get back into a crouch. If its a big goal I may do a little bit of a fist pump or if the guy who scored happens to look my way as they're skating back to the center faceoff I'll point at him as if saying "you're the man" or something. Other than that I just let them celebrate themselves.
I remember in highschool there was this one goalie from another school who used to always place the butt end of his stick into the pocket of his glove, paddle facing straight up in the air, and make circular motions in the air with his stick. It was so dumb.