I named them Pick n' Mix, because they look like Pick n' Mix. Also, yeah I did just kinda use the pony creator from the official free Flash game for their design.
One thing I find interesting about earlier concept art of the show being, how some of the outfits look very horse-themed, with saddles and even bridles. https://derpibooru.org/images/985265?q=saddle%2C+official I do miss the simplicity of the earlier seasons, where MLP was just a fun horse show, with stories that were more personal and slice of life for each character, and not as fanservice-y, or trying to endlessly one-up itself as the later seasons.
Oh yeah, I intentionally gave them a diaper, otherwise no one would really care. Also, Pick n' Mix is Any/All, go wild.