How do you use broken pottery as a garden decoration?

I do pottery for a hobby and frequently end up with pots that are cracked and therefore unsaleable or pieces that break in transport or while on display.
At a party last night a woman asked me for my broken and cracked pottery. She said she sticks it in the ground as a garden decoration.

I could not visualize exactly what she meant to do.

Anyone ever use pottery in this way? Do you have a photograph posted anywhere for me to look at?