What's the use of ostrich eggshells?

Wash the eggshell, draw or paint on it, which can be used as decoration at home or in public places. Can also be used in hotel or restaurant dishes. For example, the dish "Fried ostrich eggs" in the Chinese restaurant of a hotel I know is better, but more intuitive. When loading vegetables, the painted eggshells are displayed to the guests as decorations of the dishes, and the beautification effect is better. Painted eggshells can also be sold to customers as works of art.