I am one whole ball down! Haha it doesn't sound like much, but I knit up a baby cardigan and have now knit up a 100g ball and some stash yarn on it. It's knit in James C Brett Magi-knit baby DK and Robin DK. I matched the buttons to the colours in the yarn. It's so cute.
Also used part of a ball to knit a teddy bear to accompany said baby cardigan.
I'm further along on the aran sweater, I'm now knitting the back of the jumper with a stitch pattern change as I really didn't like doing the diamonds, so I've swapped them for columns which I think give the back a nice sturdy structure. It's also knitting up a lot quicker, which means it'll get finished sooner.
I used part of a 75g ball of acrylic DK on a glasses case for my Mom, it's a nice little thing, so I may write up a quick pattern. Might.