I found this vendor selling carved coconuts made into bowls, plant holders and pots. Really cute, the craftsmanship involved is very high, each one in the husk and shell of a single coconut.
He has a wide variety too, see the hen below, wouldn't that be a nice place to store eggs?
Find him in the Khlong Latmayom floating market, one of the best Bangkok floating markets that Thai's visit, but few farang. At the map below, where the green arrow is, the market is open at weekends.