There's already a question on this (with the same exact title). However, there is one big issue: he is using 3rd party editor tool.
Is there any command to edit the biome? If not, can I give myself a grass block that has a texture of a certain command?
I cannot use a 3rd-party editor as I am admin on someone else's realm (and the are unactive)
I have seen maps with custom texture packs and believe I can replace the plains grass with another one (e.g taiga)