Check out this dude's stylized grass substance. It's about halfway down; https://www.artstation.com/contests/feudal-japan/challenges/51/submissions/33225?sorting=latest
Also, check out screenshots of Fortnite. Maybe that's not the exact style you meant to go for, but I think that hyper-colorful, high contrast look is kind of the thing you should lean more towards with stylized materials like this. Of course the important thing really is integrating the material into the rest of the game,…