Pebbleart Preston at Ashford, Kent

This delightful handpainted pebble originates from Pebbleart Preston, a Facebook site. I found it on a small car park bollard outside the Premier Inn North/Woolpack pub in Ashford, Kent. At first I didn't know what to do with it exactly, then went online for Pebbleart Preston, and discovered that it runs on similar lines to Bookcrossing, only without all the tracking: it seems that the only rule for these sites (and there are a few more apart from Preston) is just post on the appropriate site and either keep or leave somewhere else. Love it, great idea. I'd love to know the history of it.