I made this hanging planter using part of a pallet (I'm not up to speed on the types) because I wanted something different for my garden. It took only 1 hour in total including painting and varnishing. I used the inner tube from a bike tire on the insides of the planted to 'grip' the plant pots. There is no bottom, so there is no problem with drainage.
The hardest part was sewing the pallets by hand, so I have since bought a reciprocating saw.