There's a lot of them out there that make interesting hats. The one in the pattern link I gave you is a knit 6, p2 rib. I've also seen k 5, p1. K3, p1. K3,p2. One of my favorites is for a rib stitch that lies flat and won't stretch. This is the Twin Rib stitch. It looks the same on both sides. It's cast on in multiples of 3. First row: k3, p3 across row. Second row: k1, p1 across row. Another one of my favorites is a thermal stitch. This is cast on in a multiple of 4. It's knit one row, purl one row. Knit 2, purl 2 for two rows. Repeat these four rows for pattern. It looks like the waffle pattern on long underwear. It's extremely warm. But I'll warn you. I did a blanket like this for my granddaughter when she was first born and the blanket is extremely heavy weight wise with this stitch.