I associate colors with many things, synaesthesia being what it is. Kinks as such are not specific enough though - for instance impact play: It can be a deep blue to pale blue when receiving sharp pain repeatedly on the same spot, goes into chrimson and indigo tones for more spread-out impacts, but blunt impacts are mostly in the verdant area, sometimes brownish. Receiving side is usually more vivid while giving side less saturated but brighter.
It is a similar thing with tools and outfits, when they spout natural colors it is more of a giving thing - in that the mood of a scene is influence by the color those things have already. Mostly I stick to achromatic or highly desaturated tools and outfits but with rope I stick to undyed natural hemp or black and pink contrast for that gives me a really tasty sensation. I am not big on kinky outfits, mostly wear something comfortable and not too distracting, though I dabble in harnesses, uniform-y clothing, and robes. Have not really thought about their color in terms of fitting them to a scene, practice, or mood.
What I do almost every time is control lighting though. I have full control over intensity and color gradients and did many experiments on how they affect my mood.
For example: I use dichroic lighting with soothing animation - glimmering, shifting, that sort of thing - with orange/pink for heartwarming, caring, passionate, or earthy play. Teal/grass green for messy play, bodily fluids. Orange/teal and Pink/teal go great with penetration with toys, pure red/deep blue work wonders with impact play - something about chromatic aberration and pain sensation just clicks. Bondage goes full spectrum with a very specific animation I call the emotional rollercoaster.
I keep discovering new connections almost every time I look at that one.
Super difficult to have partners agree on these though, so it mostly depends on how much they're into optical stimuli.
A flag for my personal kink identity? That is something I have to think about, but probably using either as many colors as I can or a black-and-pink contrast. Soemthing fractal perhaps.
