This patch replaces all the orange mushroom platforms with the clouds seen in Super Mario Bros. 2 (Japan). Note that the stem of the mushroom is still technically here, as placement over background elements will result in one blank tile, so use responsibly!
Made with the help of doppelganger's SMBDis.
Database match: Super Mario Bros. (World)
Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)
File SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
File CRC32: 3337EC46
ROM SHA-1: FACEE9C577A5262DBE33AC4930BB0B58C8C037F7
ROM CRC32: D445F698