Good job--great idea for a guy gift too, I think guys are always hard to buy for. I looked at cans at Lowes the other day and they are about $5.00 each now. Remember when they were less than $3.

Some colors require more additive than others. Gallons have been short for years because of that.

maybe behind a switch plate you could cut out a piece of painted drywall and take it to a real paint store and have them match it

Alabaster if you would like a brighter off white and Dover White for a creamer white. I have SW Antique White trim in my main living areas. Its a pretty color and works well with my warmer wall colors, but it might be too dark for you. I'll use a brighter creamy white next time to have more flexibility with wall paint. I used BM White Dove in bedrooms and bathrooms.