Do you know any actual good champion concepts?

Im searching for some good champion concepts/ideas but looking at boards there aren't any that include even a simple art. Do you know any good concepts (with an original art highy appreciated)? I already saw the old YinYang champ idea and this frog champ that has its own website, dont remember the name, and thats kinda what i'm looking for. Also there are many concept arts on this one deviantart profile, theyre signed as lol concepts but there arent any kits included. Share some well polished ideas you know, thanks!