How can I make micro-scale water?
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: