Thanks @komemiute! I’ll have a think.
Our icons are generally scalable vector fonts, so they work at any resolution, and usually are from something like https://fontawesome.com/ (at it’s MIT license friendly).
The chat is in a bit of limbo, in that highlighting it when anyone says anything (like it used to) is useful but slows down the front-page of the forum a bit. I’ll have a good look at it next week to see what I can do to improve that. I think it should highlight if anyone mentions your name explicitly though.
For emoticons or emoji, we can use any jpg/gif you can supply and I’ll happily set them up. They do need to scale down to 20x20 size, but you can convey quite a lot in that