Okay, so the list is done for now. Here's the basic idea:
Many (but not all) emoji are vector. There's some old ones that are PNGs and I haven't got around to fixing them, so I figured it was better to leave in the old ones than remove them entirely. Emoji will follow your font size. so
BIG TEXT and
LITTLE TEXT will have the appropriately sized heart inside. Emoji also have a minimum height of 16px, so if your type is really small it'll still be visible.
Now then, here's a couple freebees for you.