Inspired by the photo of the lemon yellow and dark green vest in this news article. Note that I might not have captured the pattern accurately; swatching would answer that question.
Work rows 1, 2, 5, 6, 9, and 10 in color A (eg, green). Work rows 3, 4, 7, and 8 in color B (eg, yellow).
Shown with a cast-on count of 17 stitches.