The Lichen Smiley is cool, but obviously not natural. My fave bit of lichen is at Glencullen, because it's a double spiral
http://www.megalithomania.com/show/image/635
Doesn't show up too well there, because of the angle it's in. There seems to be something odd about lichen growth on quartz/quartite. Certain parts of the stone seem to support lichen while others don't. I have seen circular growth too, which lead me to speculate that early rock art may have been people simply carving where the lichen grew if they found an odd design like that*. Another possibility was that RA was replicating these 'natural' patterns. Being crystal allsorts of patterns could occur.
*Just for the record, I didn't say it's a very good theory :-)
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