I used Lifestyle Toe Up Socks - No Swatch Needed.

Cast on 12 sts to 28 with needle #0.

I loaded the fair isle design as my last pic, when the new window opens, drag it to your desktop (Mac) and print it.

Fair Isle doesn’t stretch, my socks are a little tight.

Here is what I did:

When I worked on fair isle I wanted to bring the yarn I didn’t use to the beginning of the new row, here is what I used http://www.youtube.com/watch?v=O2L4Fo82zwk

Don’t forget to tight the first st at every needle.

After I finished the heel, I k 2 rows with color B, k 2 rows with color A, rib 4 rows, k2, p2, CO on fifth row, with color B.

Very stretchy cast off http://www.youtube.com/watch?v=abBhe-JYmgI

Have fun.