I really like this approach and think I will try something along these lines with my children when they are older. (Twins, only 8 months now) I don't want to stifle creativity, but I also want them to be active.
Out of curiosity are you an educator of some kind?
I'm glad to hear that!
I started in education as an informal educator in a youth movement as a teenager and I was a high school teacher for a few years in my mid-twenties (I taught English and Physics).