Katrina, Beth, and i are each making a scarf in 2018 by doing one row every day, whatever the color of the sky that day. Katrina and i were talking about it today, and both of us expected that, at this point, the scarves would be almost entirely gray, but we've actually had a surprising number of blue-sky days. We're each choosing whatever color we noticed, and so at the end of the year, our scarves will all be a little bit different.
Back in December, Katrina and i went to Michael's when all of the yarn was on sale and bought several skeins of yarn - a couple of shades of gray and a couple of shades of blue, thinking that that would probably pretty much cover it. And then...for the first few days, the sky was straight-up white. So we went back to the store to get white yarn, and that's the second most-used color so far (after blue).