one way to do it would be to manually add seafoam from an actual picture, ut to many this isn't possible (lack of camera and a sea, lol). I saw a filter the other week though, and the water had foamish stuff. I don't remember the name, but the guys at digital-elements.com (the same guys who do World Builder) do the filter. Aurora I think it's called, you can find some sample image in this forum itself if ya do a search for it, it wasn't here too long ago. One of the images had water with "roll over" foam sorta. Maybe that'll do the trick.