This is my first draft of the archway I designed for Jhuntara's sanctuary lake. After completing the design of the archway, I wanted to see how it would look against a rising/setting sun. I liked the result so much, I added an ocean scene to the background and posted the image here for all to see.
The archway is made completely of intersecting boolean tori, with a stretched cube used to "slice" a flat surface from the front and back of the archway. The support columns are simply an organized arrangment of cylinders, cones, and spheres (no boolean operations required).