Lots of denim ideas here:

https://www.pinterest.com/patriciaunderhi/denim-hotpads/

Cut the denim to the size you want. Place 2 pieces right sides together and put a layer (or 2) of quilting batting on top. Sew around 3 sides and a little on the 4th side. Turn right side out, press , slip-stitch the opening, and top stitch all the way around.

Hi! Maybe this will help

https://weallsew.com/upcycled-denim-hot-pads/

These are really cute. https://www.hometalk.com/14049205/how-to-crochet-denim-trivets-with-denim-yarn

How to Crochet Denim Trivets With Denim Yarn

I would sew them together in a square with quilting batting between the pieces.

Here is a video tutorial:

https://www.youtube.com/watch?v=_2tdS9zY7wY

Hi this is Peggy. I hope this video helps you make your denim hot pads. Search Results

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Just need enough material to ensure heat is blocked.

If hot pads are to protect counter from hot pans, then I would buy a tile and put rubber feet on the bottom.