When I posted my finished lattice scarf on Craftster, I had some requests for a pattern, so here it is. :)
I used: Patons SWS in Natural Earth, on size 9 needles.CO 18 st
Knit 4 rows garter stitch
Row 1: K2, (K2tog, yo) 3 times, K1, (K2tog, yo) 3 times, K3
Row 2: K2, P to last two st, K2
Row 3: K3, (k2tog, yo) 2 times, K3, (K2tog, yo) 2 times, K4
Row 4: K2, P to last two st, K2
Repeat these rows til it's the length you want it (I made mine about 5' long, but I probably would've made it longer if I'd had more yarn)
Work 4 rows garter stitch
BO.