The water in this game is rendered so beautifully, I think it'd be sort of cute to have a fountain or a wishing well. Maybe the wishing well can be a place where you can type in messages that are "wishes" that maybe others can see and read. I think it'd be a cute way to have an in-game suggestion box (that is placing a "wish" as a suggestion) but it could also just be a for-fun thing.

I think optionally you could throw really tiny amounts of crowns into it for a visual and add a little animation for it. It doesn't have to change how the game works, I mean, plenty of people throw their change away to wishing wells without expecting a real benefit so I'd assume it'd work the same in game.

Yes, this is a very sentimental suggestion but I think it'd be really cute. Maybe make the fountain in the Town Square a place where you can make a wish. I'd expect many spiral knights would have hopes, wishes and dreams with the way we're fleshing out the story line and the world through the mission system.