This woman's tutorial/walk-through on how she made her costume wings is *amazing*. Awesome creativity, and some pretty amazing engineering! Perfect for cosplay (I absolutely have to make a set of these wings)
Shop for Run Mat at S&S Worldwide. Get their motors runnin' and movin' as a team! Get their motors runnin' and movin' as a team! Kids (or adults) walk along with the lead person pulling the mat down to keep it moving.