I made these piggy banks out of empty mayonnaise jars. I painted the lid and ears (heavy card stock), painted and hot glued dowel rods for the feet, and hot glued on a tail made from a pipe cleaner. I cut out the opening in the top with a knife and hot glued around the sharp edges. My kids just love their piggy banks.
Spray paint the jar (you can use pickle or mayo or any kind you choose.) Let dry. Stencil or free hand the design on the jar. You can put on any theme you want. I made this one for my little girl and I left the lid off so she could put her money in. You can seal it and put a slot in the top if you like.