What is the best way to make the trivet made with river pebble/stone?

Shi6571699
by Shi6571699
Love the items made with river rock such as trivets, coasters, and rugs. I made a trivet with the stiffened felt and it was a disappointment. Glue went through the felt! I would like to make these for my sons new house! Would someone give me adviRc on how to do these without failure? Thank you!

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