Originally just a comparison of the ringworld Halo from the game series of the same name, afterwards a few scifi relics were throne in for further comparison. A version without Larry Niven's ringworld is also an option, in case the procedurally generated terrain is too much of a strain on your system. It was only in building this project that I can fully appreciate how ludicrous the original Ringworld is. It's too big. The idea of continents and seas become silly. Artistic renditions go for landmasses, something like what is presented here. Really it ought to look more like a mishmash of color.
The Halo ring has the opposite problem, although to a lesser degree. What appears to be continent-like landmasses are more like what we would consider islands.