Waves is an external library that we've included in Materialize to allow us to create the ink effect outlined in Material Design
There are several ways to customize waves, you can either use pre-created classes, or you can define your own color by creating a new class
waves-light
waves-yellow
waves-orange
waves-purple
waves-green
waves-teal
If you want waves to form to a non rectangular shape, there is an option for circular waves. Just add the waves-circle in addition to waves-effect
waves-circle
waves-effect
