Here's a neat idea for multiple icon edits for various things either minimap animal icons or quest giver arrow icons.
For animal minimap/map icons, it would be great if it had outline colour around certain animals like green, orange and red. Green for animals that you can just pick up or the ones that run away from you, orange for animals that you either need to engage the combat with them or they sometimes attack and red for aggressive animals which attack first.
For quest giver arrow icons, the default tree icon for tree quest giver, but the arrow icon image changes to boulder if it is a boulder quest giver, tree stump, toad and so on, I think it would be a great indicator to what to look for when it says greet a quest giver or to which quest giver you are returning to or delivering or simply going towards for.
As for the coloured outline whichever works best for devs either a outline around the minimap icon for the animal or something else as for animals like ants or bees their raidable "homes" would have the outline, same with bird's nest.