You are right on this part,
Recolored versions of (author created) icons are allowed as long as they are made for certain purposes- such as potions.
But, is this icon really for a "certain purpose" ? or are you just making it for fun and for people too download it? Because at the hive we take stuff seriously, and if this icon is truly what you want and its for a certain purpose than its up too the Moderators.