Wow, I just posted the simulator link on a whim, as I wasn't sure how accurate it was in the long run. Was trying to help an FCmate this morning and saw like 70 people viewing it. I did a few edits, added an in-spreadsheet note about needing to make a copy, and how to do so. I also found an actual formula for determining the "closeness" of colours, so it might guess the colour name more accurately now (assuming the +/- 5 rule holds, at least).

Anyways, with the free week coming to and end, I wish you guys all the best of luck in your chocobo colourings, probably won't be around to update the sheet anymore, so anyone is welcome to do so.