I've done the two other princesses drinking out of frappes as well:
Celestia - [link]
Nightmare Moon - [link]
Decided to do one with the Changeling Queen was because she's probably my favorite characters of the MLP series (apart from Discord). Animated it right off the episode itself and used my editing skills to make it seem like she was enjoying a caramel frappe. I've improved on the graphics along with animation if you compare this with the other two.