honestly as for multicolour i dont think you’ll find a broader range of colours than on wild-type/partridge coloured roosters
most unusual colours probably goes to silkies, they have both blue earlobes and black skin
and of course the meme ayam cemani
i think one of the snazziest/bordering on eyesore colourings belong to bielefelder roosters. they have autosexing (can be sexed from birth) barring and i’ve seen one in person and it made my eyes hurt. i love it.
I think salmon faverolles deserve a place because they have such dramatic dimorphism
they may be solid black but australorps’ feathers are extremely iridescent and shine a brilliant blue/green
probably one of the favourite show bantams are belgian millefleurs, they come in both regular and lavender dilute
one of my favourite genes is double lacing notable on barnevelders, they can come in the same colours as single lace
pencilled campines are super stripy this one looks like a gyrfalcon
lastly i just discovered one of my new favourite colours only this year called chamois, here’s a chamois friesian
