It would be amazing if you can bulk update colors on multiple lists in a space at the same time (the list icon itself).

I use this to track sales activity, and am using colors to indicate which accounts I've updated and worked on. Green color means today, red was done yesterday, etc. I pick a new color each day. However, it would be useful if I could multi-select and chance the icon color in bulk, that way I can clear it off multiple lists. I've got 20+ lists and growing, so turning off the color 1 at a time is tedious.