but it depends how you want to achieve it, and that depends on your camera angle.
example: first person - apply double vision effect and wave example: third person - make your character move wierd example: third person isometric game - apply shaking and waves to fullscreen. and so on..
Sea Monsters template - Isometric Also includes 40 pages PDF of optimizations and "how-to" for your games, and how the "sea monsters" template was built. Follow link for details :)