Has anyone built Icon-Based Reactions?? (rather than Kudos)

Would love this! Just having kudos as an option seems so old-school.

There have been some discussions / ideas posted about this before, but I don't know of anyone who has implemented it custom. Following here to learn more.

For reference, here are some relevant past posts:

• Emoji reactions - Slack-style 
• Add emoji reactions to posts 
• Reactions to posts / replies a la Slack