We had a link to this catamaran made from plastic bottles before. For Earth Day, they are getting lots of coverage (USAToday - includes an interesting video of the build) as they continue crossing the Pacific.

Check out their blog for lots of pictures, facts, cruise information and the like. Looks like a good time, for a good cause, and really shows that you don't have to always do the "tried and true" to get out on the water!