These striking structures are by renowned event producer David Stark and recycled from used off-packing materials/cardboard and made to resemble cacti in planters! Apart from his super creative website they are also featured on his blog David Stark's Sketchbook. He is now working on a furniture and accessory line with West Elm.
Speaking of recycling, these prickly pear cacti were saved from a soon to be demolished planter and relocated to the savior's yard... Bravo! Awesome cactus! (via the blog The Grackle)