Oh wow good stuff. I tried doing this but my wife wouldn't let me put it in the tank. she likes all the pretty colors... -.-
Yeah some that I did find were like that but the ones pictured are all solid and I love the root piece as wellThose pieces look to be fairly rotted. I wouldn't use them if you can puch your fingernail into the piece of wood and have it sink in. I would also remove all the bark that you can.
Nice looking pieces though. Especially the root piece.