Problem: our 1990s placemats were a little too big for the table, and the scalloped edges really dated them style-wise. But they always washed up well and they were a gift from my Mom. What to do?
I poked around in my closet until I found a light weight skirt that I never wore since it didn't really fit right. After trimming the scalloped edges off of the placemats, I proceeded to cut the skirt fabric into strips ...
... then machine sewed the strips onto the placemats and "quilted" them down with wavy lines.