OOOOOOH, hmm idk i've dillied and i've dallied but here is my final answer~

Chan: navy and blue and sea green and sparkly, like bioluminescence
Minho: almost white but tinged red and orange at the edges like an open flame
Changbin: soft and diffused and pale green/yellow like sunlight poking through a tree canopy
Hyunjin: really gentle soft pink and pearly when he moves with it, like the inside of a seashell
Jisung: bluey violet and so so bright like he's bordered with neon
Felix: almost pure white and so sparkly like an old lightbulb filament just pure glow
Seungmin: bluey grey like the most comfy denim jacket you've ever worn, makes the air around him look like there's a blur filter on it
Jeongin: DARK like almost black at the edges but golden the closer it gets to him at the centre, kinda like a black hole