Here at Teamwork.com, we love to use emoji's. Within Teamwork Chat if you type ":" into the message field, you'll find a list of suggestions. This list will update as you type more characters. For example try typing ":b".
To find a full list of the emoji's we support, here's a link to our cheat sheet (be prepared for lots and lots and lots of emoji).
Besides the ones listed in the cheat sheet, we also support the old school short emojis too, like :)
Have fun and see what you can come up with.
For more information see how you can use Markdown in Teamwork Chat