This ROM hack replaces daytime with deep sunset. The graphics are reduced to black outlines over strong colour. It has a few interesting ramifications - for one, the hills and bushes of the overworld suddenly become disguises and concealments for walking enemies.
Super Mario Bros. (JU) (PRG0) [!]
No-Intro Name: Super Mario Bros. (World)
(No-Intro version 20130731-235630)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7