Lady Rainicorn (Adventure Time) takes a trip to the Pony Kingdom to meet with Princesses Celestia and Luna (MLP:FiM). I’ve wanted to make an AT/MLP crossover ever since I started watching MLP, and have even given thought to making a fanfic … here’s a drawing of one possible scenario.
 
I don’t care what the canon says or the creators’ intentions are, I’m going to keep on pretending that Equestria is a kingdom in the Land of Ooo.
 
I mean, both have has talking animals, no humans in sight, princesses, rainbow-colored flying equines, and the main characters of each series both live in a hollowed-out tree and have a different-species “sidekick”, for goodness sake! It would work so well!
 
Inkscape, a few hours’ time…  
MLP:FiM and Adventure Time (c) their respective creators/companies…