Ok, another villain idea for my RP that I'd like to shoot past you-
The Yugui clan, a clan of plant-using ninja. Not a release-use, but much in the way Aburame cultivate bugs, they make plants. Some make hypnotic pollen, shoot thorns, catch targets in vines, etc. (Some inspiration from Usopp's pop greens in One Piece).
They have a grudge against Konoha because they coveted Hashirama's wood release when he was alive, but all efforts to try and buy samples failed, and in their closed nature were unwilling to submit to the Senju. When Hashirama died, they went as far as to launch an attack to try and steal his body. They failed and Tobirama slew their leaders, but most of the clan escaped.
Not a lot has been heard from them for awhile as their lands are somewhat different from Konoha, but recently they moved to the land of Sound after accepting an offer from Orochimaru.