Pattern available from BYOV (http://byov.blogspot.com/2010/09/pattern-double-sided-kni...)

Uses stranding and intarsia to create two argyle panels. The panels are then sewn together, and a pillowform is placed inside, creating this double-sided argyle pillow. Charts are included for the argyle pattern.

I improvised with the yarn. Basically, use the charts provided and adjust the number of “framing” stitches to get the desired size. You can also adjust the size of the argyle on your own, or add extra repeats, whatever is necessary to get the pillow you want.