I just picked up 3 concrete countertops free on craigslist. I'm going to turn at least one of them into a potting bench.
Got pipes today to make a base for the countertop to sit on and I have an old copper vessel sink that I will fit over the small drain hole. This particular top is turned upside down in the pic. Haven't decided quite what to do with the other two. One is very Zen looking and I may just plop it in the garden. Love the slate drainboard on the third one. Might sit a tub for dirt over that opening and make a second potting bench.
base in the making:
Will post pics of the finished project if anyone is interested :)