I started playing on a new server with my fiancee recently, a server that used Towny. So we started a town with tree houses in mind, calling it 'Lichenville' (she hates the name). We set out on a search for the perfect meadow to terraform, preferably on a peninsula because we had discussed building a lighthouse. After searching four biomes in opposing directions, we finally found the perfect meadow, laid down chests and a bed, and set off to work. She did tons and tons of collecting on this build, and like most of my previous server builds, I couldn't build this without her. Here is what the result was.
I built up the rocky base so to add some character and to make it seem more like a real lighthouse. It also conveniently hid our base underneath.
And the lights inside actually work too. They rotate around the center piece.