Here's a trick I thought I would share with you. If you already knew than I guess I am just out of the loop then! To get the look of "stitched" down ribbon without actually sewing apply a piece of double stick adhesive to the back of the ribbon length first and as you apply it to the card gather and pinch the ribbon to pucker up the adhesive as you press it down in place. Just be sure you cut a little extra ribbon as you need more length to gather to get the "ruffled" look. I found it "sew" much easier than turning on the sewing machine! No pun intended!!
This effect is used on the Valentine card ~Be Mine~ with the two flowers and pearl in middle.