So here goes my attempt at posting some pics of my river rock message boards.
this should take you to an image of the smaller board i made, it's a little neater looking.
Here is a shot of both boards I made. the larger one is just three small square cork boards tacky glued together, same with the rocks and little frogs.
and the last image is a closer look at the large board. I had placed random rocks on the board and along some of the seams to hide them a little.