I've particularly been jonesing for an infinity scarf for myself, and have been looking for a pattern. (An infinity scarf is a nice, long scarf that is actually one giant loop, and can be worn many different ways .)
Last weekend, after another search that turned up nothing, I decided to create my own. I have a soft, green brushed worsted-weight acrylic I knew I wanted to use (I'm allergic to wool), so I was looking for something that would highlight its softness.
I first tried this amazing cable-and-puff stitch pattern , but it looked messy with my fuzzy yarn, and I didn't like that it had a noticeably not-pretty back side. I wanted a reversible pattern so I could do lots of looping and swooping with my scarf.
I decided I liked the idea of puff stitches, though. I found this pattern for a puff-stitch dishcloth  and decided to modify it from there. It features puff stitches in every third crochet row, but I used them in every other row to make it more symmetrical.
I used a size J crochet hook. Make your scarf as long as you'd like. I crocheted about 94 rows before I decided it was long enough. I used about eight ounces of yarn. I know that sounds like a lot of crocheting, but it went really quickly once I decided what I wanted. I would guess I made it in less than five hours.
I used this technique for making puff stitches , yarning over and then pulling through each ch-1 space four times, for a total of nine loops on my hook before pulling the yarn through.
Here's my pattern, and the photos below are of Milou modeling. He shows just how versatile the infinity scarf can be.
Puff-stitch Infinity Scarf
Row 1: Chain 34. Turn and HDC in third chain from hook. HDC across (33).
Row 2: Chain 3 (counts as first HDC and Ch-1), and turn. Skip next HDC. [HDC in following HDC, ch 1, skip next HDC] across, with your last HDC in the original Ch-2 space at the end of the foundation.
Row 3: Chain 2 (counts as first HDC). [Puff stitch in ch-1 space (immediately after your chain), ch 1, skip next hdc across], ending with puff stitch in the final Ch-3 space, and then HDC in that same space.
Alternate Rows 2 and 3 until scarf is long enough for you. To connect the ends, make sure the scarf isn't twisted. Slip stitch the final row of puff stitches to your foundation chain, all the way across. Fasten off and weave in ends. Turn right side out (so seam is hidden) and have fun finding different ways to wear your infinity scarf.