Styrofoam Single or Bulk Giant Balls
Why am I telling you about big, white balls? Well, check out how much a store charges for their version of giant outdoor Christmas ornaments and consider doing it yourself instead. http://www.thisnext.com/item/E0930C39/54A8A523/Outdoor-Christmas-Ornaments These balls will get you started. The bigger ones come in halves you just glue together. Spray paint them in different colors (put a coat of something on underneath or a lot of the paint will be absorbed by the foam) and then use stencils (ie snowflakes) or a loose measuring tape (for stripes) to sketch your pattern. Then spray within the desired design with a strong 3M-like spray epoxy and sprinkle glitter (order online by bulk- very cheap... and "holographic" glitter is the best at catching the twinkling lights) thickly. Shake off the excess and ta da! Congrats! You have fancy balls! p.s. Don't forget to spray them with sealant if they're going outside when finished. You don't want soggy balls.