This motif is very popular in traditional knitting from northern Europe. If you are looking for inspiration for filet designs knitting patterns are a good place to start.
Foundation chain: Ch 36.
Row 1: (as chart) yo, insert the hook into the 6th ch from the hook, work 1dc this completes the first mesh. Cont to the end of the row using the chart as reference and counting each ch as either a sp or a st. Read the chart from right to left on odd numbered rows and left to right on even numbered rows. Turn.
Row 2:Ch 2 (counts as 1dc) cont to the end of the row, work the last dc into the 3rd ch of the beg-ch. Turn. Cont to foll the chart, ch 2 (counts as 1dc) at the beginning of each row, and work the last dc into the second ch of beg-ch before turning. Fasten off yarn.
om open mesh-ch 1, sk 1 sp or dc, dc into the next dc st sm solid mesh-dc into the next sp or st, dc into the next dc st
Pattern by permission from Crochet Blocks in a Box by Luise Roberts, St. Martin's Griffin, 2007