First of all, I love the aged look of this garland, and I think you could even use an organe or black fabric and it would look equally awesome. (And may I suggest, if you go with a black fabric, why not try an neon orange "glow in the dark" fabric or acrylic paint..... trust the Halloween Queen)
A few things you'll need are: some twine, heavy duty thread, craft needles, fabric, stencil (or not, if you're good at free-hand) and fabric or acrylic paint.
Measure out how long you want the garland to be. Cut the twine to the desired length. Be sure to consider where you want to hang the garland, and make sure you leave enough on each end to tie off, where you want it to hang. (This may be a good time to have a helper hold one end, while you decide where you want it to go!)
Make 14 squares cut from the fabric of your choice. Lay out the squares against the twine, to be sure that you measured correctly. (May I also suggest marking the twine with a sharpie marker, so you know where each square is to be placed. Trust me, this will save you time and aggravation!)
Then draw or stencil the letters on each individual square. Paint each letter, set aside to dry. Once the letters have completely dried, attach each square by sewing the edges to the twine.
You're done.... it's ready to hang. It just that easy!