We used a silver plastic table cloth from Oriental Trading and hung it from a wall using masking tape, draping the cloth onto the floor to protect it from cake debris, and taping it to the floor as well. This was an awesome setup because after the smashing, all we had to do was remove the props and roll all the mess up and straight into the trash. Easy clean-up!
I found wood cut letters at walmart and used black spray paint around the edges and blue acrylic paint on the face to spell out his name and hung them from under the windowsill.
The piñata is hand cut from a cardboard box, covered with fringed tissue paper and 2 glue sticks worth of glue. The key to a sturdy piñata is to work with the shape of the box. I never cut the corner on the base where it attached to the front. Or the two side pieces on the bottom of the 1. After marking the piñata in 1 in bands all the way around, I alternated 2 strips of dark blue with 1 strip of light blue tissue paper and filled in any sparse areas. Since this was just a decorative piece and not an actually candy holding, hitting piñata, I didn't have to keep a fill hole. I did still add a loop of string in case we were to hang it somewhere.