Unfortunately, I believe that the existent wave particle has been removed its thread, or more accurately, the thread has been removed. However I can lead you to some other possibly useful meshes and particles~
-Glave has some very aquatic things. Including an extravagant whirlpool and some brilliant bubbles
-Theirry's got a beach chair, a beach house, and a beach umbrella.
-Hamilton has some very good out-door items for the scenery!