Hi there! I’m sorry I took so long to reply – I was putting together a resource page that I could easily direct you to. 🙂 As far as hair goes, I only use Remi’s textures, so selenaq13 is basically my go-to hair retexture person. I have a few other links there too – most of them don’t update anymore, or no longer post hair in Remi’s colors/textures.
As for unnatural colors, my game is sadly lacking in those. 😦 You’ve reminded me I need to hunt for more MM unnaturals! (Or make them myself…) The ones I do have are by alienpod and nyren.