A rip of the sky tileset from the Super Mario Bros. tileset of Super Mario Maker 2. Due to the amount of tiles, pipes are merged with the background files (and night decorations that needed some recolor too), so be aware of them if you use a different background (it's still versatil enough).
I actually was thinking of doing a gfx14 replacement, but as a separate submission (as a sort of "general smm2 smb. objects" or something) because I'm aware some people nukes everything in the vanilla game, including FG1 and FG2 objects.
Just a suggestion to people wanting to use this, if you wanna save some exgfx space or use a different background, move the pipes into a custom replacement for gfx14. (Ideally you'd make an 8-bit one of those anyways)
Good job with this rip. Everything is organized nicely for ease of use.