What colours would best match my slate grey feature wall?
Depending on your taste there are a few ways to go with slate grey. If you want to match it with a bright colour something with a darker hue such as magenta or turquoise works well. If you are looking to make a statement without bright colours black and white together can look really striking against slate grey.
Typically slate gray has a more bluer hue. I think warmer hues would be a great compliment to slate gray but if you have a more modern taste then I would suggest cooler colors like blues, whites with a splash of black in accessories and furniture frames. Here is a link that may be helpful to you. Good luck! http://www.colorcombos.com/combolibrary.html