The moss block was added into Minecraft in 1.17. One block of moss can be bonemealed to create a larger patch of moss, azalea variants and moss carpets. Moss can't be crafted, but it can be found in shipwreck chests, lush caves and can be obtained by trading with wandering traders. Hope you like this design!

https://minecraft.fandom.com/wiki/Moss_Block

Credits: I got the textures from the Pixel Papercraft Block Generator:

https://www.pixelpapercraft.com/print/minecraft-block