Something I am constantly reminded of as a mother and as a piano teacher of young children is just how creative children are! Their minds are learning and absorbing so much and there really is no limit to their imagination and creativity. I think that is a good and simple reminder for us as music teachers - keep it fun, keep it exciting, and encourage and praise creativity. See what they come up with. Encourage composition and improvisation. Get off of the piano bench. Enrich their lives with the wonder of music.
My four-year-old son drew this "song" for me the other day. I think he got the idea from this video we watched a couple of weeks ago that really made an impression on him. Note the raindrop notes, the apple notes and the walking houses and people (with musical notes for feet, of course). Oh and the crab in the middle is one of my favorite parts.