You can use whatever colour or sheen of nail polish you like for this. I was looking for something metallic but sort of marbled. I like copper and gold but I knew I also wanted a pop of colour. I happened to have some small bottles of sparkly nail polish in gold, copper and a bright blue. I don’t wear them anymore so I decided to try to use them to get the look I was after.

First I poured the copper into an old Indian takeaway tray, followed by the gold and finally the blue with the quantities of each getting smaller and smaller as I went along until I ended up with this.