Just read the entire micro series yesterday. My favorite is Rarity, second is Fluttershy then Rainbow dash. Mainly because of the humor.
I'm surprised that nobody made a MLP show type vector of Wheat Grass. Grabbed the opportunity. Love her overall design, and became one of my favorite Earth Ponies. She is found in the Rarity Micro Series.
So here it is, an ordinary smiling vector of Wheat Grass.
Groovy men... Peace out
Cutie Mark vector here [link]
It's a free to use vector.