I think Plex turned out pretty good, don't you think? Of course his life span was quite short. Poor thing. The kids absolutely demolished him in a matter of seconds.
collect all your cereal boxes for months. Cut them out in the shape you think he should be. Tape it together. Then do the paper mache thing. You know: flour and water. Soak strips of magazine or newspaper and cover everything with it. Let it dry. Then paint it and you're done. I forgot a step. Don't forget to arrange for some way to hang the pinata. It's a lot easier if you do it before the paper mache part. I threaded a pipe cleaner in and out of the back and then the twisted it together so it looked like a loop. Don't paper mache over it. At the end you just tie a string or cord on the loop and you can hang it up.
I love to do crafts but I'm really bad at instructions. I just kind of made it up as I went. If you really want to do a Plex pinata you can ask me specifics if you need to.