Put a lid on it

I did a show in Martinsburg, WV and saw this awesome mosaic of Van Gogh's self-portrait on the side of an art gallery.
When we got to our venue (the library) there was another similar mosaic on the wall outside of the meeting room.
The mosaic artist had done a community project with the kids at the library about everyday art.
 And what was their mosaic medium?
Recycled plastic caps of all sizes and shapes! How cool is that?