Yarn Dilemma

My well intentioned husband bought me a lovely sweater pattern by Marie Grace Designs called the Lily Cardigan for my birthday last November. He also bought me the yarn required to make it (see above). I think he over estimates my knitting ability a smidgen but I really love the sweater so I want to make it. Last winter I caught the knitting bug for a spell because I had a little baby to keep warm. I knit a pair of pants for her, a hat, a "suntop" and then hats for her older brother and sister too (out of fairness, you know?). These projects were also meant to get me geared up to start the sweater, to get into the knitting groove so to speak. I chickened out and postponed the project to the summer which is now winding down and I still haven't started. I think I need another little project to get me going again.

I picked up these four balls of yarn in the 50% off bin hoping that I could make something with them but I need guidance. Does anyone know of a simple hat in an 18 month size that I could make with a ball of any of these? Any other ideas? Here is what I have: 50 g balls of Waterlily Classic Elite Yarns 100% extra fine merino, Debbie Bliss Cashmerino aran, Debbie Bliss Rialto Dk 100% merino, and a 100 g ball of Ella Rae classic superwash. Help!