If you're doing Cointaker, get 2-LED Premiums for the inserts.
Cool white for white, blue, green inserts
Warm white for yellow, orange, red inserts
Pink for Battle Royale insert
Color changer for Super Hero insert
These will really bring out the vibrancy of the insert colors. I'm not a fan of color matching because the blue is just TOO BLUE an the green turns more of a forest green...I like the 'emerald' look of a green insert with a cool white under it & "sky blue" of a cool white under a blue insert. IMO, red literally does nothing to red inserts...might as well just use warm whites to keep it simple. Yellow LEDs look orange - warm white will make the insert a more distinct yellow compared to orange inserts. Orange LEDs are kinda dim, actually - so again, that's why I use warm white.
If any of the inserts seem too bright, just paint the top with a white paint pen and it will look perfect. Some will say use frosted, but I find that the frosted cap changes the color temperature a bit....I like the Prem 2-LEDs the best.