Begin collecting fun die to use in your lessons and practice sessions. These come in handy when a particular song or section needs repetition. Instead of telling your student / child how many times they need to play it each day, let them roll for it.
I have a general rule that if they roll a 1, then they get to roll again! Kids generally like to choose which one they will roll and it makes the repetition process a little more fun and enjoyable for all.