Make the Pom-Poms
Cut 2 circles out of cardboard, each about 11/2" (4cm) in diameter. Cut a small hole in the center of each circle; make a slit from the outside edge of both circles to the center hole. Hold both circles together with the slits aligned. Wind the yarn evenly around both circles (going through the slits to the center holes) as tightly as possible. The more times you wrap, the fuller the pom-pom will be. For this project, use about 5 yards (4.5m) of yarn. Cut the yarn around the outer edges of the circles. Cut an 18" (45.5cm) yarn strand and, pulling the cardboard circles apart very slightly, wrap the strand yarn firmly around the pom-pom centers a couple of times. Tie the strand tightly in a double knot. Remove the cardboard circles completely, and fluff out the pom-pom. Trim ends to even out if necessary, but do not trim the strands around the pom-pom centers. You will use that yarn later.
Make 10 pom-poms.
To Attach the Pom-Poms
For each pom-pom, cut two 10" (25.5cm) strands of yarn (20 strands total). *Working across one short edge of the scarf, with crochet hook, pull ends of both strands halfway through one stitch above the scarf edge. Holding the cut ends in each hand, braid the 4 strands together for about 1 to 11/2" (2.5-4cm). Make an overhand knot at the end of the braid to prevent unraveling. Thread 2 of the yarn tails from the braided ends on a tapestry needle and insert the needle and yarn tails, from left to right, under the yarn wrapped around the pom-pom centers. Remove the needle. Rethread the tapestry needle with the 2 remaining yarn tails from the braided ends, and insert needle and these 2 yarn tails under the yarn tied around the pom-pom center, this time going from right to left. You now have 2 tails on the left of the center yarn and 2 tails on the right. Take the 4 strands and tie them together tightly in a square knot to secure the braid to the pom-pom. Trim ends to even. Repeat from * 4 more times (5 total), spacing the pom-poms evenly across the short edge of the scarf. Repeat for other short edge of scarf.