Few years back I ordered a flat of 16 ga field loads from B&P. The shells were friggin yellow. My first thought was they shipped me a flat of 20's - nope. I had a flat of yellow 16's.
Talk about psychological problems - REALLY made me pay attention to loading the car for trips to the grouse woods. I would find myself stopping half way up north just to confirm that I had packed the shells I wanted to pack. I even called B&B - "sorry, I know what you mean but that's the way they came in."
For the record, my favorite cartridge will always be the red paper 20 ga shells from Winchester. They just remind me of my dad.