This pattern can be adapted to circular knitting by knitting all the odd numbered rows.
Repeat Rows 1 - 8
Row #SideBegin RowRepeatRepeat From *End Row
1W*purl* 
2RK1*slip next 3 stitches to dpn and hold in back; k3, then k3 from dpn; slip next 3 stitches to dpn and hold in front; k3, then k3 from dpn*k1
3W*purl* 
4R*knit* 
5W*purl* 
6R*knit* 
7W*purl* 
8R*knit*