One tip I've heard for coaxing yourself out of a color rut: find a piece of art that you like and use colors from it to inspire yourself.
I think the same can be said of a lovely grouping of flowers. I'm not always a fan of yellow, but I love it grouped with the green, pink and white tones, here. My Nana loved yellow, and was a little sad about not wearing it all of the time in her later years. She felt white was a more dignified color for an older lady to wear.
I hope she's not too hard on me, if she can observe me, when I'm older. I intend to not cut off my hair and wear whatever color I love that the moment - choices that I know wouldn't fit with her sense of what a proper mature woman does!