Bark rocks

I saw on ebay someone selling rocks made from bark, so I found some pieces in the woodshed and made my own.

The two pieces on the left are oak, while the longer piece is maple. I tried ash but found it too flaky. First I brushed the loose dirt off with a toothbrush.

Then I sprayed them with a grey primer.

Next I dry brushed with raw sienna.

Then a dark brown washcoat.

Lastly a black dry brushing.