theres tones of diffrent ways to do it one way is mess with coloring and settings
i could probably make u a small tut on that ?> but i think one these pro's will get u straighten out right away sry i couldn't give u exact settings right off. but thats how i do it take a cd4 use the liquid tool or somtimes just the ripple filter . make 4 layers of same thing and mess with coloring and settings . color and color dodge gl i hope i ws of some help if not sry again i tried :P