Idlis are light and delicious. And to make them more tasty and nutritious we can add various ingredients to them.
We all can cook and make our food interesting.
Let me share a secret with you! I was not fond of cooking, nor eating. But as soon as I became a mom, an instinct was born within me. It was that I should cook and I should provide all that he loves to eat outside, at home.
Reason?? :) the Gr8 Indian Moms mentality... the food should be hygenic and nutritious!! 
This made me alter the Idli to Mix Veg Idli.... May you all enjoy this with your kids!