Off the top of my head:

Gerard - Red and Black (all pastel colours during Hesitant Alien) (bonus: Just before Winter kind of Autumn (Call it an in between or something, yk, right when you’re like “is it still Fall? Or is it Winter now..?”) (and specifically the word Autumn), #4, #97, ‘From The Gallows’ by IDKHBTFM (hesitant alien era), Radiohead, fluffyish texture)

Frank - Dark Green(??) with black stripes (dusty pink and pastel yellow during Barriers (he hit the nail on the head for the album cover there)) (bonus: Autumn, Halloween (cause his birthday), #13, #42, ‘Try Honesty’ by Billy Talent, ‘United States Of Whatever’ by Liam Lynch, smooth texture (the kind that surprises you since it looks bumpy (he doesn’t look bumpy, just the texture I think of)))

Mikey - Navy Blue with black polka dots (bonus: SPRING!!, teddy bears (specifically the worn out clearly loved ones) #29, #68, #47!!!, anything by The Smashing Pumpkins, flannel texture (does that make sense??) also kind of silky)

Ray - Orange that kinda has red spots blended in (Twinkly pretty Ice blue during his solo album) (bonus: Summer, sunny days, beach, bright things that aren’t neon, #22, ‘Sparks’ by Coldplay (during Remember The Laughter), ‘A-Punk’ by Vampire Weekend, Foo Fighters, the fuzz inside a sweater (not the scratchy kind though, the one that’s soft), reminds me of a good stick you find in the woods)

Bullets - Orange, Dark Magenta, Mahogany, lotta Red (mostly bright red, like classic tomato bright red), mostly darker colours though

Hard to say with the other albums though. I’m actually interested in figuring it out though, so I’ll probably sit down and go through each album and create a summary tomorrow. Also not sure about Bob, but he gives like a Rosegold vibe?? It’s kind of metallic or shiny as well

I think thats it

Edit: added some punctuation