Start with a styrofoam ball, size of choice and a few packages if thumbtacks. I worked with silver, and white for my spheres. Use Elmer's glue to give a little extra security to the tacks hold, once you start to layer them like fish scales, they'll be tightly locked in place! Start on one side and work your way around to give a cyclical pattern around the sphere. I worked in small sections at a time, but sure to top the ball off at the point opposite of its bottom.