We all spend our days working with scripts and layouts and table occurrences to design many of the same things: inventory systems, invoice systems, CRMs, student information systems, etc. Basically something that keeps track of data for entry, storage, viewing, and reporting.
What different purpose were you able to fulfill by building something that was unique, different?
A long time ago I built a quiz system where the points moved a team along a leaderboard (It was nuts). I still have this file but can't remember the password.
I also built a Sudoku generator for the fun of it.
What different-purpose app did you build?