DIY Plastic Bottle Ottoman :: downloadable tutorial is available but i think this is pretty straight-forward. circles are the strongest forms to build with. great outdoor seating idea with waterproof fabric and i'd fill the bottles with something weighty. or, i could just make it as an indoor ottoman. i have many ottoman how-to's pinned but never find the time to gather up the old tables or the foam cushion can be expensive. great alternative, so creative!