When I was younger, I always thought that water towers were actually large towers you could go inside, like an elevator with a room in the top. To this day, I still like to picture it. I took a picture of a large short building - I believe it was a church - and used a clipping mask to make a large watchtower jut out from the roof. I added some windows, that way you can do some actual watching from the top. I made sure the colors all matched, used a screen to add some texture to the image, and then toned down some of the colors as well. The building has now been transformed into an interesting people watching resort!