I was thinking, perhaps, for a small amount of crowns (anywhere ranging from 250 to 500) you could buy emotes to use in-game that can only be obtained via monster drop (which is a rare drop and if you do get it via a drop, it is automatically added to your emotes bar), or through crowns, and due to other players already possibly having the emote, it would be non-giftable.
A few ideas for emotes could be a "Point" emote, or perhaps a "Backflip" emote, and like the monster drop alternative, once you buy them, they are automatically added for use on your emote bar.
Of course, I am sure Kingsisle could do much more with this idea should the slim chance they ever decide to use my suggestion, but it was just a little fun idea I had, and I would love to hear what other's think of it.