Are you thinking natural burial? Is human composting legal in your area? It's basically they put you in a tube with some wood chips and flowers and let you decompose completely into soil - no insects, just the bacteria that's already in you, and no bones left behind at the end. Your loved ones can pick up the soil (which is literally regular dirt at that point) and plant a garden or spread wherever you want, just like ashes only greener because of the energy and pollution of cremation. In my area you can choose to send your soil to a forest that is being restored to help replenish nutrients on the forest floor too.