I think these would be cool. A few of us had them in our Lotus. They are that rubber with a recessed coin pattern . Would be entirely waterproof too
That said, any mats would be easy to make. Just make a template using paper and can use any material you like. I made mats and carpets for my Lotus using an automotive carpet I ordered on line. Then found an edging product from Bond Product. Can do in contrasting colors too. Edging goes along carpet edge and you use a hot iron to active the glue. I think my mats and carpets for my Lotus cost me like $35.