Wall tiles any colour 8x6 inches (15x20cm) (Elm Park RM12)

Hi,
Does anyone have any 8x6 inch (15x20cm) wall tiles that they don’t want. I need about 8 in white but any colour will do as I’ll use white tile paint. Can’t buy 8x6 tiles anywhere anymore, I’ve tried everywhere! The toilet at my daughters house has been replaced with a smaller one but had no tiles behind it so now there’s an ugly untiled section.
Thank you