I've tried the old tried-and-true "yes, dear" but apparently this doesn't express the proper amount of agonizing over colors that are only several Ångstroms apart.
Told ya...
Marriage doesn't live up to the hype....
... Never has, Never will. Usually, shortly after the 'hornymoon' it's a down-hill run... (Been there, done that. TWICE) ... luckily, managed to escape with my A$$ (both times)... sine me; happily single & never again. Life's too short.....
Just pick a color. Love the one color. Be that one color. Hate the others. Especially if she likes them. She will choose the one she likes.
But I'll say it again......pay a professional to do it. It is so much easier to work the OT, do side jobs, or even sell a kidney and hire a professional than to "help" decide the color and paint.