Of course it’s a matter of taste. I’ve just implemented the style of the Untiy showcase where the foam is white and only visible at the intersection points:
http://halisavakis.com/my-take-on-shaders-unlit-waterfall-part-1/
http://halisavakis.com/my-take-on-shaders-unlit-waterfall-part-2/
Also a nice reference for water in cel shading:
