This plaster pillow tealight holder, originally made from concrete, seems to be easy to make :)
Links:
Plaster Pillow Tealight Holder (Make A Concrete Pillow Style Tea Light Holder) (englisch)
also in German: Betonkissen Kerzenhalter selber machen
via: DIY tutorial: Make A Concrete Pillow Style Tea Light Holder via DaWanda.com