You mean with stuff related to actual lighthouses? Why not just modify an existing one that you like the base format of to fit?
Plenty of resources in the RM on adding custom node icons for the nodes, placing a custom background is easy as is changing the colors up of the site.
I may play around with making one up just to try out. If you have one of the free styles that you like as a base and want me to give that one a try let me know which one it is and I'll see what I can do with customizing it some. It may not be exactly what you want but it would at least give you a start.
This is something I did (just the background - which stays stationary as you scroll and simple node icons) in about 2 minutes to a default style.