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It is made using increasing and decreasing of crochet stitches. It is also called chevron pattern.
Here is a pattern for an afghan http://www.craftown.com/cropat26.htm
Here is the basic pattern
Quote:
"Work in back lps only throughout.
Row 1 Work 1 dc in 4th ch from hook, 1 dc in next 3 ch, over next 2 ch twice, 1 dc in next 3 ch, 2 dc in next ch, *2 dc in next ch, 1 dc in next 3 ch, over next 2 ch twice, 1 dc in next 3 ch, 2 dc in next ch; rep from * to end. Turn. Row 2 Ch 1, 2 sc in first dc, 1 sc in next 3 dc, sc2tog twice, 1 sc in next 3 dc, 2 sc in next dc, *2 sc in next dc, 1 sc in next 3 dc, sc2tog twice, 1 sc in next 3 dc, 2 sc in next dc; rep from *, end last rep with 2 sc in top of t-ch. Turn. Row 3 Ch 3 (counts as 1 dc), 1 dc in first sc, 1 dc in next 3 sc, dc2tog twice, 1 dc in next 3 sc, 2 dc in next sc, *2 dc in next sc, 1 dc in next 3 sc, dc2tog twice, 1 dc in next 3 sc, 2 dc in next sc; rep from * to end. Turn.
Rep rows 2 and 3, continuing stripe sequence."
End Quote

Watch the video to understand the increasing and decreasing.
Source(s):
http://cache.lionbrand.com/faq/360.html?language=En

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