Puff stitch almost looks like tiny seashells on the crocheted fabric, that "puff" out on the right side of the fabric and are flat on the wrong side.
A puff stitch is worked as follows:
2. Repeat Step 1 four more times, inserting the hook in the same stitch each time. You should now have 11 loops on the hook. Be careful not to work too tightly, or you won't be able to get all those loops off in the final step.
3. Yarn over and pull a loop through all the loops on the hook to complete the puff stitch.
Puff stitch can be used in single rows as an accent, or all over for a completely textured look. If using puff stitch all over, you will want to alternate with rows of single crochet so that all of the puff stitches "puff out" on the same side of the fabric.