The infamous background of Ganbare Goemon 2 (SFC), mainly used in lake / sea levels. I did my best to port this background to Super Mario World, but I couldn't keep all the colors, sorry about that. Since the "HDMA" (gradient) consumes a lot of space, I removed it from the original BG.
The color of the BG itself is from the level "Samurai Woods / Mount Hagakure".
It uses palette 2 and 3.
Also, it uses BG2 and BG3.
Credit would be great, but is optional.
UPDATE: Removed the clouds from the sky to optimize the palette.
If you're not planning on using this with water covering the bottom of the screen like in the screenshots, then I suggest shifting the background down a few tiles or changing the layer 2 BG initial position to 19 with .