Thanks for the comments guys, to answer that first question, I honestly had no idea this was an established colour scheme for them as I have no knowledge on any of the 40k fluff, I just like painting! I saw them painted like this somewhere else and gave it a go. Sorry for any confusion haha
Nicely painted squad but I am very perplexed as to why these clearly Ulthwe' Craftworld Wrathguard have Saim-Hann Craftworld symbols on the loin cloth things.