Several years ago when I was working at Romni Wools, a yarn shop in downtown Toronto, I was asked to make a sample from the then-new Malabrigo Twist yarn. I found this pretty Shetland Eyelet lace pattern in Barbara Walker's A Treasury of Knitting Patterns (page 179), which worked up nicely into a hat.
This hat requires 100 grams of aran weight yarn (the sample used 55 grams/83 yards, so even if you don't have a full skein, you might squeeze a hat out of it).