A fun idea for those extra tiles is to create your own decorative tiles. I use acrylic paints and chunky stamps. Once the paint is completely dry, apply one or two coats of glaze.
If you have an artistic hand you can create your own design. I used fun foam for the raw side of the tile which I found had more grip than felt. Using silicon glue helps keep it water resistant. Because there is no baking involved these are not meant for placing hot items on or dish washer safe! A little soap & water and a soft sponge is all you need to wash them.
Here is just one that I made a few years back........had many more, but some how they mysteriously
disappeared during my move last year. (Guess the movers didn't like purple