Re: Quads in Brown and Grey
I don't know all the MAC colours that well, but for brown I would definitely put Satin Taupe (fave colour EVER!), a dark brown colour (maybe Espresso), a highlight colour (something like Shroom), and either a lighter brown (not sure which colours are light brown) or a bronzey colour (like Bronze). For greys I would put a black or a very dark grey (Carbon or Typographic), a medium matte-ish grey (Print for a fairly true grey or Scene for a grey with a blue-ish tinge), a more frosty darker grey (something like Kinght Divine), and a silvery colour of some sort (Silver Ring).
Sounds like you are like me and love neutrals! I especially love browns and greys