Maine Line (sand) is a worsted weight blend of 75% Pima cotton and 25% Merino wool. I have always liked this combination because it looks and wears like cotton, but gains the elasticity of wool. In this case, the sample, knit on #8 (US) needles, was quite firm, lacked drape, and was less elastic than I had expected. But it knit up evenly and would be fine for a sturdy sweater. I'd like it for outerwear.
Crayon (blue) is one of Knit Picks' few novelty yarns. It is a light weight boucle of 100% cotton. It's perfect for children's blankets and toys. I don't see it as a garment for either children or adults.
Comfy (pink) is Knit Picks' newest. It is worsted weight but knits up light and thin. It is 75% Pima cotton and 25% acrylic. For the second time in recent memory I have fallen in love with a synthetic (blend). The first time was Berroco Comfort (all synthetic). This yarn is soft and caressing, and very summery. Perfect for a tank.
Shine Worsted has problems. This blend of 60/40 cotton/modal looks gorgeous in the skein. It has rich color and delicious sheen. It is the most edible-looking of these yarns. But I hate how it knit up on #7 needles. It's uneven and inelastic. I want to try it again on a smaller needle, but I doubt that I would use this yarn.
Because of this I didn't bother to try Shine sport. I'll keep it for stash. I am curious about Cotlin, a dk blend of cotton and linen, but I don't want to swatch it yet because I am saving it for trim on a current project.