You can donate the amount you saved on crackers to help one child's education for one year.
For the Earth quake relief fund and help a family to rehabilitate
For an NGO which can train a youth so that it fetches him his piece of bread.
Eco-friendly fun
Instead of crackers, arrange a small picnic with family to a nearby place. That will be completely eco friendly and will generate the employment (lost in Diwali crackers)