Posted: Jul 25, 2010 3:55 pm
by mark1961
The large kidney shaped dark indigo one near the bottom right. Looks like it might be a worn down brick to me. Also the curved flat one above it could be a roof tile or pot shard.

(Scroll down to "page 8")

Different coloured pebbles like this can make for art as well as an illustration of the passing of glaciers mixing up geology.