XF 2.1 "Like" emojis - where can I get more?

As you all know, there are several emojis available for when you want to Like a post. These are slightly oversized (36 px IIRC). I'd like to know where I can find some more of these, and add them to the list. I know I'd have to push them to the directory first, but I don't know where to source them.

TIA!
 
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