Incredibly simple project and easy to customize. Multiple of 7 plus 2. Then just follow the directions and go to the desired width.

Pattern:
Row 1: Ch 254, (sc, ch 2, sc) in 2nd ch from hook, skip 6, ch 5(sc, ch 2, sc) in next ch; repeat from to end of chain.
Row 2: Turn, (sc, ch 2, sc) in first ch-2 sp, ch 5, (sc, ch 2, sc) in next ch-2 sp; repeat from to end of row.
Repeat row 2 to desired size.