I'm totally in love with shell stitch motifs at the moment.
In this post, I have prepared a couple of swatches of the Diagonal Shell Lace Stitch. This stitch looks good in just about any yarn weight.
It requires a multiple of 6 plus 2 stitches and is knitted over 10 rows. The motif of diagonally slanting shells is created through yarn over increases and k2tog and p2tog decreases on both the wrong and right side rows.