how to animate a tile in a mesh?

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I'm not this far in my game yet (not by a longshot!), but somewhere along the way I need to find a way to animate a tile in a mesh.
The mesh is quite large, since it represents a terrain. The tiles would be waving grass or rippling water etc.
Perhaps I could switch UVs in a singelesurface, or change brushes somehow?
I was hoping there was a function like loadanimbrush(), but there isn't, or is there?
I would sure appreciate if someone could guide me in a doable direction. I don't need full working code (though that would be nice); just some advice on what way would be fast or simple. (simple? yeah right!)
greets.