Looks perfectly clear to me. :-) Anyway: create a cube, apply a water texture to your satisfaction. Possibly world space or object space, I'd have to experiment. Create a grayscale of water ripples in a image editing program like Photoshop. Create a terrain in the terrain editor, erase the picture in the terrain editor and apply the ripple. (put resolution 512.) Lower as much as you can in the terrain editor. Click OK. Stretch the terrain so it covers the top of the cube, put the Y dimension of 0,01 or so. Lower the terrain so it merges slightly with the cube. Apply the (a) water texture to the terrain, to your satisfaction. Enter into camera view, position camera close to the cube and looking over the top of the cube. put a ... conical, probably ... spotlight so it shines directly from above. Click on Edit, and apply the same ripple picture as Gel. Set the colour of the light to your satisfaction. Now mask the edges of the cube with something like Don Tatro did. That should be it.

-- erlik