After I started building a piñata for my daughter's birthday party, she changed her mind about what she wanted, leaving me with this big unused sphere.  I turned it into an alien planet for another occasion.

This is a really simple piñata. The rings were made from colored poster board, and the planet was decorated using leftover crepe paper from the previous piñatas. It was supposed to look like a green planet with white and pale orange atmospheric clouds. I'll let you be the judge of whether or not it turned out that way.  The same planet with brighter colors would make a fun and easy piñata for a kid's birthday party.