Styrofoam balls + strips of fabric + straight pins = instant ornaments
Ok, this isn't rocket science but maybe you just needed a little inspiration to fill up the gaps on your tree, or to mix with a bunch of pinecones in a basket, or in a glass container sitting on your mantel, or strung across the table as a runner, or hung from fishing line in your window...you see where I'm going with this, right? Just wrap the strips around the balls until they're covered. Yep. That's really it.
p.s. If you cut the fabric strips on the bias (diagonally), they won't fray nearly as much. Or to make life even easier, you could use grosgrain ribbon instead of fabric.
p.p.s. I used "tidy" pins, which are shaped like staples with really long ends, which you can find in the same section as the straight pins in your craft or fabric store. Tidy pins don't have that little ball on top so they sit flat against the styrofoam and you can't really see them. Plus, hanging fishing line, string or a ribbon from them is really, well, "tidy."