Another great question! In short, to summarise, most colours do - however, there are some which a lot better than others, such as gold, royal blue, electric blue, yellow, pale purple, light lime and metallic silver.Depending if you prefer a more subtle effect, you may prefer to use gold and metallic silver in your mix to creat a bit of separation in your room whilst maintaining a continuous flow.If you prefer to add a splash of colour and create a vibrant effect, why not try an electric blue , yellow or pale purple? These work wonderfully with grey and can really brighten up a room.