I have actually made some in the past! What you can do is take a tile, such as you'd use for the bathroom, and glue it to a couple of wooden slats (I think the ones I used had originally be intended for edging a shelf or something). Use wood glue or a glue gun. (I am not sure if they have glue guns in the UK. We have them here. Basically, they are a gun type device that plugs in to the wall so it heats up. You can buy sticks of glue that you put, one at a time, into the back of the glue gun. When you pull the trigger, the glue gun secretes some of the glue from the stick, which has been melted by the heat of the glue gun. They work well for crafting and they come in large and small sizes, with glue sticks available separately and sized accordingly.)