Before you lose too much sleep racking those brains for more ideas, this change is already in the request list and a friendly and talented member of the art team called Nate has been chatting to me about it just this week.
It's not an urgent change and I told him to put more urgent stuff first, but when time permits, it's coming.
LINK
(DominoDev) Re:Icon change request: Rare Harvested Materials (Alternative Solution Li
