Stitch pattern: "inventing" your own

Today I experimented with the number of rows in the stitch pattern.
I tried:
Cast on twenty stitches.
row 1 & 2: *knit one, purl one - repeat from * to end of row.
row 2 & 3: *purl one, knit one - repeat from * to end of row.
Repeat rows 1 to 4 for pattern.

This is two sided stitch pattern. By that I mean, it looks the same on both sides. Hey, does this stitch pattern look familiar? Yup, it is the moss stitch. ...this happens sometimes.

Homework: what if you used an odd number of rows.

Next post: Ribbing