Oceans and ponds:

This is from a Maya Unlimited Help Tutorial

This is from another tutorial on floating objects . The cube and the sphere have varying buoyancy settings, pitch and roll.

In the following animation, I used an emitter to create a wake in the pond water. I attached the emitter to a locator and animated the position of the locator over time to move the emitter, thus creating a wake.

Here I used 2 emitters to create interfering wakes

This is an ocean wake, following the same process as in a pond.

Ocean shader: ocean shading by changing the foam parameter, to increase the foam.

Miscellaneous:

Jellyfish with tentacles painted with Paint Effects (from a tutorial on Alias website)