For this water test I painted a piece of foamcore black, and spread vaseline over it, which I pushed towards 'shore' each frame, trying to maintain the shape of waves. The result is definitely promising, though way too choppy here, like stormy seas. I want the lake's surface to be a bit smoother, but that can be worked on, maybe by sculpting tiny wave shapes that can be pushed through the vaseline, so there's more control. I can also see this done on glass with a light underneath, I should be able to cut a piece at work that has trap doors so jenny can rise up :)
I cut this with my earlier 'reflective-light' test, just to jazz it up a bit.