plastic bottle + vegetable oil (half fill the bottle) + water (fill the rest of the bottle + 10 drops food coloring + alka-seltzer (broken into pieces, placed 1 at a time into the bottle) = lava bottle
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!