Kids could make a raft or float! :) A different way of recycling plastic bottles. Here, a boat is made entirely of plastic wrapped bottles drawn into the shape of a boat. Even a front and rear seat have been made entirely of wrapped bottles.
Recycled CDs Form Colorful Floating Waterlilies by Bruce Munro. Again, i love re-purposed art; art made of trash. This was quite interesting and i think would look good as an instillation in some city.