Hi everyone, I noticed that in my bathroom, on the edge of the wall tiles, there is a PVC "piping" that covers the edge of the wall. It's something like cable trunking, except that it's rounded and much thinner. I have no idea what it's called, but my problem is I'm not sure what colour to use for that. My walls have 2 contrasting colours, light grey and black. Should I just go for one single colour or colours to match the tiles?