I've slowly built my own version of the rainbow which goes: burgundy, rust, terra cotta, ochre, olive, sage, denim, navy, eggplant, plum, chocolate. I wear a lot of colours, but I wear them on my terms: dark, rich, subdued, murky, usually referencing my personal colouring in some way. Black/grey/white (true neutrals) help round things out and tie outfits together, along with a small collection of dusty pastels (mint, sky blue, lilac) that play well with my base colours. I still have a smattering of bright true red, but haven't added any new red pieces in the past year or two, and probably won't replace my red pieces when they wear out. Ditto turquoise and brighter berry colours.
I have a fair amount of texture and pattern, especially "blendy" ones like tweeds, heathers, and low-contrast stripes. I'm a minimalist when it comes to accessories, so it's rare that I go out the door feeling too "busy"; the "take off one thing before you leave the house" guideline never resonated with me. The MK quote makes sense to me if you've inherited a magpie gene, but I think that one skipped me. I'm a bit allergic to anything bright, shiny, or "extra" on myself, although I appreciate all those things on others.