The different types of urns for human ashes are usually categorized by material such as marble urns, wood urns, paper urns that biodegrade, glass urns, ceramic urns, and metal urns. Brass and metal cremation urns are the most popular as they are traditional and durable. Other types of cremation urns include scattering urns, ground burial urns, and niche urns for columbariums -- these urns are described by how families use them.