I'm still playing (and loving) BattleBlock Theater, and the time has come for player created playlists to shine. As such, developer The Behemoth has provided fairly detailed instructions on how to get your playlist featured online for the world to see.
Basically, you just need to have nine classic levels, five challenge levels, and one secret stage. After that, just determine whether the maps are single player or co-op, upload them, and cross your fingers. The Behemoth will select the best ones and check for playability. If chosen, the playlist will become "famous," which will allow others to collect gems and yarn as currency for their game.
Behemoth is also offering a free Chicken Prisoner head-face for anyone who plays a Furbottom Feature or an Arena Feature as a limited time offer. They aren't saying when the offer ends, but it will be switched out for another character at some point.
How to get Featured [The Behemoth]