Prep your index cards by gluing them together in pairs using your glue stick. Mine were lined on one side so I stuck 'em together with the lined side facing. 9-10 finished cards make for a sweet six-foot garland, though you can make more if you wish.
Set up a happy paint-friendly work space to paint up your cards. I used two strips of painter's tape on each card to mask off three stripes, and then I painted them red.
Create a scalloped pattern by folding an extra index card into thirds and then sketching a curved shape at the edge. Trim with scissors and open it up.
Roll out additional lengths of crepe paper in red and blue and bring the whole party to your sewing machine. Stack the colors however you fancy while keeping the card-festooned strip on top. Use a long zig-zag stitch and slowly stitch through all your layers from one end to the other. It may take a moment to get the hang of it, but move slowly and you'll be fine.