Begin by kneading the polymer clay until it's soft and pliable. Work on a piece of parchment, to keep the clay clean. Cover the polymer with a second piece of parchment and roll it out flat with a rolling pin or dowel to about 1/16 th of an inch, or your desired thickness.
Use a small star cookie cutter to cut out star shapes. Remove the extra clay from around the stars, and leave them in place on the parchment paper.
Next, create a small hole in one tip of each star for the wire, using a small toothpick.
To bake your star, place your parchment paper full of stars on a cookie sheet and bake in the oven to harden them, according to the manufacturer's directions for baking temperature and time.
Once the stars are baked and cooled, paint one side of them with the iridescent paint. Once dry, flip them over and paint the back of each star.
To make the garland cut a length of about 4 ft of wire at a time, and thread on one tip of the star at a time. Twist the wire several times around the star, and then leave a gap of 1 ½ inches to 2 ½ inches between each star to create the star garland.