I have a source for these, just pick them up for free, some are 4' x 4', some are 32" x 32", 4'high , I cut them down to 3 feet high and fill them to the top
Cmag, that looks fantastic! And yes, Pete will be very proud of you! I love recycling materials into useful items.......that's a great repourpose project there! And it does make the uglies look, well, pretty!