I love these magnets ($18 for a set of six) from Etsy seller Maiasauramade. Each magnet in this set of six features a one-of-a-kind, handmade collage. For durability, each paper collage is sealed with several layers of mod podge, then sprayed with an acrylic sealer. On the site, Maiasauramade writes, "when my second son started going through jars of baby food like gangbusters, I looked at all the lids and thought there must be something I could do with them. Magnets seemed like the perfect solution." I have to agree.