Umashankar Aggarwal, 57 collects various kinds of notes from denominations ranging from Re 1 to Rs 2,000. Each one is preserved with its serial number.
Here are a few other ideas that you can do with your currency collection. Divide your collection between printed currency and coins. They are generally viewed very differently by collectors. If you think any may indeed have some collector value, start a spreadsheet for the currency or coins by country.