Try Canyon Cloud WD410 by Behr.

All the colors in this house were custom tinted. We would typically start with a handful of Benjamin Moore colors, put up 2'x2' samples and review at several times of day to see the changing tone in the natural light. We would then proceed to combine two colors or select one and test mixes of that color at 200%, 150%, 75% and 50% pigment level. A great exercise if you have the time.

i just did the same thing at my house, with all of the samples of benjamin moore whites. drove my painter and contractor NUTS!! hahaha. its funny how they think waisting a $100 worth of sampled paint is a big deal when it would cost me $10-20,000 to repaint if i made a mistake.