Resin urns are urns that are made with polymer plastics and another substance to make them stronger. Resin and ceramic urns can be painted or have the dyes embedded into the plastic mixture. They are strong and can be molded into shapes. That is why so many shapes are made from resin and ceramic materials. Some ceramic urns can be painted and some can be engraved when fired. Some can display photos of your pet to make a lasting memorial.