WearOGram

Bring a smiley to someone's wrist.

WearOGram lets you send emoji to your friends' smartwatches, and receive them in return. Simply select a contact, flip through the available emoji, and send it off! It's a good way to say "hi" to old friends, to tell a loved one you care, or to flirt with a new acquaintance. With only a few emoji to choose from, it's often faster and more casual than Android's built-in "draw emoji" feature.

Both sending and receiving work on a handset too, although its really designed for wearables. This lets you use it with friends who don't have a smartwatch yet. Both sender and recipient must have the app installed to communicate.