Cut a large circle out of felt—this will be the base of your trivet.
Attach river rocks to the felt with hot glue, starting in the middle. Try to find rocks that are about the same height (or "flatness") to help make a stable surface. Minimize gaps between the rocks by rotating or flipping the rocks for a closer fit before you glue them down. Keep gluing rocks until you are about 1 inch from the outer edge of the felt.
For the outer edge of the trivet, let the rocks overhang the edge of the felt circle slightly when you attach them. This creates a more "natural" edge.
Turn the river rock trivet over, trim away any excess felt around the outer edges, and you're done!
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