This mosaic egg (made with tile and mortar, after prep of a plastic egg purchased after last easter (LOL)) is hollow, weighing maybe 8 or 10 lbs, so it is not solid. I dont have any idea what would happen to the mortar if it were left to freeze and thaw, but for inside decoration, and sprint decorations I think it will survive for a few years. It is almost two feet tall. The hexagonal tiles are assorted hand made polymer clay tiles, and some donated from a local tile store.
The entire mosaic egg is made from scrap tiles (except the mortar and the grout are deliberate purchases from a local tile shop. Just for fun. Will deliver to anyone within 50 miles of Cincinnati…. cost is $200.
It is OK to laugh, photograph is taken on my mosaic tile basement floor.