City Blues Hat Kit
Dyed on 100% squishy SW Merino DK, kit come with a 25 gram solid color mini and a 50 gram striping skein. That's 75 grams total, which should be enough to knit nearly any size DK weight hat you would want to make, with very little waste.
To make sure you don't run out of yarn, I recommend choosing a simple hat pattern without cabling, which uses more yardage.
The City Blues sample is Staci Perry's Double Thick Cuff Hat pattern. The pattern is available on Ravelry and I've got a project page if you would like to see my notes on needles/gauge/etc. My username is Michelethemaker.