What if you knit instead of purl -- would you get shetland lace? This alternates R and L decreases for less diagonal pull in the lace. Rows 1 & 3 (WS): Purl Row 2: k1, *yo, k2tog; rep from * Row 4: *SSK, yo; rep from * across, end k1 Rep these 4 rows.
Update! Found the pattern. It's from Interweave and is $5.50 or can be found in Interweave Knits summer 2005 or Holiday Gifts 2006.