Rick Rothstein, sorry I didn't reply. Don't ligon here much these days.
That was cool, getting MVP without using Excel.
Some of my 'masterpieces' are driven by requirement. Usually a manager who has no clue about possibilities until you show them them they ask for the world.
The most complicated I ever did, a claims model for a pension company. People would activate pensions for all sorts of reasons. There were multiple files involved in Excel, CSV, rtf, word format. There were direct debit/credit files from 2/3 working days earlier, thousands of rows, formulae that needed copying down. Then to top it all, it had to intelligently analyse errors and tell someone who may never have used the spreadsheet what to do on what accounts in the general ledger. And a dashboard sheet that changed colours in cells depending on the number of errors. Nuts. But highly satisfying