Jan, I cast on for the Garland Cowl tonight, using this leftover yarn. I knit a cardigan with it recently, the Perry.
So far, so good, although I could not manage that elastic cast on called Jeny's Elastic cast-on, shown on YouTube. Bah! I just went with a very loose cast-on using a US11, then switching to the US10.5 for the work. I even set up the LT stitches as loose as possible without being messy.