Lakshmi of Hand Embroidery from Sadalas demonstrates using herringbone stitch as a fill stitch. She says this easy stitch is appropriate for beginners. See the tute.
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Scrap yarn is great to make a colorful pom pom Christmas tree topper
If you like making pom poms and looking for a unique tree topper why not make a big ball of pom poms out of all sorts of colored yarn to make a statement tree topper. After you have made your pom pom tree topper featured at the blog Sugar and Cloth why not use the scrap yarn to embellish the branches like tinsel?