Ok, here's what I've come across so far. I make no claims to own any of the artwork, haven't made any of these and have no idea if they're artist approved. We will remove any upon request from the owner of any artwork in these, upon verification of ownership.

Pip Ponies
MLP Pack

Those are the only two I liked enough to keep, but I'm sure there's more out there, so what do you have?

Share Instructions:
Desktop client (only one I'm familiar with): Settings—>'Manage and reorder sticker packs'—>Click on the sticker pack—>Click on 'Share Stickers'—>Paste here, use the link feature up there to create a clickable link with the name of the pack