Rule 34 Dev - can cardboard container cutie_mark feathered_wings feathers female feral horn princess quadruped royalty simple_background solo tail white_background wings unknown_artist friendship_is_magic hasbro my_little_pony mythology mushi princess_celestia_(mlp) equid equine mammal mythological_creature mythological_equine winged_unicorn black_and_white monochrome|661433780