I've seen a lot of beauty gurus on Youtube do this Colors of the Rainbow Tag. But not until I saw Jenn from Clothes Encounters, did I decide that I too wanted to do the tag, except, like Jenn, with clothing. Maybe in the future, I'll do one with beauty and skin products.
I just went through my past outfits and pulled up old outfit posts in all the colors: red, orange, yellow, green (mint green counts right? :D), blue, violet, multicolored, and pink. Enjoy;