Having windmills and watermills really emphasizes the need for lighthouses. So here is one. Taking the watermill base from DoR I made the top into a lighthouse top and added windows. Additionally, you can find different tops and various closed/blocked entrances. There's animation with two different lenses.

As it is shown, you should have 8 tiles with the first being totally white and so this makes for a good animatied combo that flashes the screen when the lighthouse lense is pointing south. You actually can make 8 way light animating, but this lense isn't big enough to make it epic. Something that covers quarter of a screen would be better, but is also more difficult.

We at ZC know that altough decorations are nice, the gameplay is what should be enhanced. Well, you can do so with this lighthouse. See the example in the middle? The player can point the lens to something so it burns or whatever.

DoR. Enjoy.

Origin Systems for inspiration.
Startropics for dedication.
The maker of the original watermill.