Samina asked if I could show how I did the picot cuff on the Whisper Rib socks.
The folded picot edge is actually quite simple. Start with a provisional crochet chain cast on, knit a few rows, knit a row of *yarn over, knit 2 together* stitches, knit several more rows and then fold the cuff in half and knit the cast on stitches together with the current row. Pictures are worth a thousand words so if you're interested I took several pictures of the process.
Crochet a loose chain of stitches using fine mercerized cotton yarn as a waste yarn. This type of cotton has a slick finish which makes it perfect for waste yarn. I trust that you know how to crochet a chain so I'll spare you the details. If not, I'm sure almost any basic knitting or crochet book shows how to make such a chain. The photo on the left shows what the front of the chain looks like. Now flip the chain to the back.
If you don't pick up the stitches from the back loop then you might end up having a difficult time removing the waste yarn, but don't worry if you don't use the right loop. You can always just cut the waste yarn.
Keep in mind that this the row at which the cuff will later be folded.
Now knit the same number of rows that you knit before the row with yarn over stitches. I began with three knit rows so I knit three more rows for a total of seven rows, including the row with yarn over stitches.
Once all the rows are knit, fold the cuff in half so that the cast on edge meets the stitches on the needle.
It's time to free the waste yarn by carefully unraveling it stitch by stitch so that each freed stitch can be knit with a stitch that's already on the needle (aka "live stitches"). This photo shows how I pick up a stitch from the crochet chain by putting the left needle tip into the back of the stitch that I want to free. Transfer this stitch to the left needle. Once it is safely on the left needle, gently remove the waste yarn from the stitch. If the cast on was done correctly you should only need to gently tug on the end to the waste yarn to free it from the stitch. If it was done incorrectly you might need to cut the waste yarn.
Repeat picking up stitches from the waste yarn and knitting them together with a stitch on the left needle until there are no more stitches on the waste yarn. All of the waste yarn stitches should have been paired with a "live" stitch.
That's all there is to it. Good Luck.