From knitty.com:

This pretty lace scarf shows off color graduations achievable through hand spinning.

The lace pattern is from "Knitting lace: a workshop with patterns and projects" by Susanna E Lewis, Taunton Press 1982. This is the zigzag portion of Pattern 52 on page 60.

Every row is patterned, so a little concentration may be required at the start, but the pattern is easily memorized.