I doubt this is new, but it’s the first I can recall hearing of it, so here you go: How to officially make blue milk. You’d think it would just be a matter of food coloring, but oh no: The reality is much more disgusting: It involves milk, ‘unsweetened blue fruit punch mix’ (uh, Kool-Aid?) and sugar. (You can still use food coloring. These folks did. Or, if you want to get all adult with it, here’s a version with Blue Curacao, amaretto, and coconut rum.)
In any case, thanks, @StarWars. New JadeCon rule: She who wakes up first has to drink the fruit punch version.