MessMoji - Emoji stickers for iMessages
Antiselfie club - Take a photo and get a antiselfie.
Imoji - Turn selfies or any photo into stickers you can text
Snackshots for Messenger - Create your own stickers in a few taps
Deconditioning Stickers - Stickers designed to mess with your notification addiction
Flashgap - Time-delayed photo-sharing app of last night's embarrassment