> I've seen it discussed, but has anyone ever created anything like this?

There've been some threads with people offering butterfly graphics or even actual stickers:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6468&forum=3
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=8201&forum=3
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=11865&forum=3
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=12096&forum=3

> Of course we could always do a blue and white boing ball

Isn't this the logo of A-Eon's Linux porting effort anyway?