I think someone could create a game about it , a game composed of story telling which as they progress they get to know more about different angles of bitcoin world which could be useful when they grew up 
ya. or play game and win coins but instead of just ordinary coins as their prize can also use bitcoin or altcoins for example or any improvised coins of value. so they will be aware that such coin is in existence in the internet or they will just know that there is such currency as that. just a little knowledge will do and for sure it is going to lead them to awareness about virtual currency.