Each season, we tend to get an official "poster" covering all of the different ponies introduced or included in their block of specific episodes. For whatever reason, season 3 never had one to call it's own. We got a fan interpretation to hold us over, but nothing official.
Amazingly enough, buried within the German Disney Channel site, there actually was a poster celebrating all things season 3!
And if you want the past posters, have some links:
Season 1
Season 2 (Fan made)
Season 3 (Fan made)
Season 4
Season 5 (being filled)
