Caron Simply Soft yarn. I used Helena Frank's Diagonal Lace Scarf pattern, found here on Ravelry.com. Ravelry is always an awesome site to go to for patterns! The scarf does have a tendency to roll up, though, so unless you can block it I wouldn't recommend the pattern.
Deborah Norville's Serenity Chunky Weight yarn. I did a simple basketweave pattern that goes as follows:
Co 25 sts (or any multiple of 5)
Row 1: (K5, P5) to end of row
Row 2: (P5, K5) to end of row
Repeat for 5 rows
Row 6: (P5, K5) to end of row
Row 7: (K5 P5) to end of row
Continue alternating the stitches every 5 rows.
Basically, you want squares of stockinette and reverse stockinette stitches to alternate. It's very simple. And I love the results on this scarf!