Trivets can be a little small, these are larger trivets that support larger dishes. With the trivets that have rounded corners you can use a 1/4″ (6mm)-radius roundover bit in a router or laminate trimmer (a smaller, less expensive version of a router). I would recommend using an oil finish, such as salad bowl finish, to seal the wood and accentuate the grain.
To download the pattern, right click on the link and select “Save As”.