The pattern I've chosen is Samovar by Laura Chau. It's a worsted weight cardigan that uses Italian ribbing as a stitch pattern. I like the stitch pattern because it's lacey but will still be stretchy like ribbing so it should fit really well.
I'm using some Cascade 220 Quatro that I've had in my stash for awhile. It has two strands of a darker aqua color and two strands of a lighter aqua color, which gives it an interesting look. Because I'm short on yardage, I'm going to knit 3/4 sleeves rather than full length sleeves. It's more spring-like that way too, which works with the yarn.
The color is really more of an aqua color, but of course it photographs as blue. My gauge swatch was right on for the stitch count. It was a little off with the row count, but I can work with that. I have absolutely no idea what kind of buttons to use with this yarn because of it's brightness. Any suggestions?