I'll start this topic by mentioning waste management as a big subject for todays discussions! Imagine how many receipts are printed, necessarily and unnecessarily... The needed ones often get lost!
Furthermore there are people who do not know whether they should fill out their tax declaration, or whether it will be profitable.
With all of the Stellar-transaction data stored it can be transformed into digital Receipts for having it stored again on devices and clouds. Thinking further you receive filled out tax declarations, as far as this is possible, due to real-life adoption.
This is only an idea. I am ready to contribute in Stellar and as this project gets attention, i will start to take more and more time for that. I am not coding so far, but i had my experiences. I would say I have the sense for coding, so I am ready to learn and work!