I've compiled categories of links to free crochet patterns for various items, all with a ripple or zig-zag pattern in the design.

If you've thought that it would be fun to crochet a handbag, a shawl or even a small item like a dishcloth in a zig zag design, this list has the free pattern links to get you started:
Zig-Zag Free Crochet Patterns

If it's zigzag afghan patterns you're looking for, here's the place to find those free pattern links:
Zig-Zag Afghans Free Patterns

More Free Crochet Patterns:
A-Z List Of Links To Free Crochet Patterns

Crochet Help and Free Patterns For Beginners