I recently scored this beauty at the Hadley Salvation Armani:
It took forever to score and split, much to my husband's amusement, but I did it, and did it cleanly. Then I primed the cardboard center, painted it a beautiful ocean blue, and poly'ed it. Grabbed a piece of salvaged barn wood (thanks, Shaun at Berkshire Barns!), bolted it down, and voila, a bowl!