I used a very tacky white glue and embroidery floss to wrap these Styrofoam eggs for Easter. You can use as many colors as you like. I twisted a variegated, monochromatic colored floss on top of my Styrofoam eggs in order to get them to look like this.
Here, as you can see, I've also glued on to this Styrofoam egg, pom-poms. Use the eraser end of a pencil to press a slight indention into the foam egg where you wish to position a pom-pom. Then fill this indention with white, tacky glue and firmly press the pom-pom into it. It will take approximately 24 hours for the pom-poms to dry onto the egg. After these have dried, twist embroidery floss around each pom-pom on the egg until it looks the way you like it.