This is totally boring:
How can I add some variance to it that helps to distinguish a rippling lake from a raging ocean from a fast-moving river, while keeping a look that's appropriate for micro-scale landscapes?
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The 1x1x2/3 slopes would be ideal for making waves, etc.:
and or the 1x2 options.
Along with some blue tiles you could make some great waves:
Obviously, if you don't want them breaking, keep the white fronts blue.
Also, if you have some Navy blue tiles you can create currents of colder water - if you've ever watched large bodies of water you'll notice they have strips of different shades running through them.
Stick to tiles on the plate rather than the 2/3s height for lakes, or for some good ripples use the Round Dish 2x2 Inverted: