To start, lay the curtain panels flat on a clean floor. Use measuring tape and a fabric pen to mark parallel lines across each panel (ours are 6 inches apart). Cut lengths of pom-pom trim to the width of the curtain panel.
Glue 1-inch-wide pom-pom trim over drawn lines. To prevent puckering, glue the trim to half of each drawn line at a time, allowing it to dry before gluing the other half.
To achieve a full effect, adhere additional strands of trim on either side of glued trim. (We used three strands—two light and one dark—for each row, sandwiching the dark trim between the lighter trim to create a bicolor look.)