It's my favorite pattern for a reason - it looks pretty complicated, but it's really very simple. It's a four-row repeat, three of which are simple 3x2 ribbing. I added garter edging, but you could easily do a seed stitch edge, if that's your favorite. The PDF can be found here, in my Google Docs.
The pattern is here:
Eyelet Mock-Cable Rib Square
Adapted by Pegi Frostholm from “365 Knitting Stitches a Year” perpetual calendar
© 2002 Martingale & Company
Square Pattern © 2012 Margaret Flanagan Frostholm
CO 43. Knit 3 rows in garter stitch (knit every row).
Row 1 (right side): K3; P2, *sl 1, K2, psso, P2; rep from * to 3 stitches from end; K3.
Row 2: K3; K2, *P1, YO, P1, K2; rep from * to 3 stitches from end; K3.
Row 3: K3; P2, *K3, P2; rep from * to 3 stitches from end; K3.
Row 4: K3; K2, *P3, K2; rep from * to 3 stitches from end; K3.
These four rows make up the pattern. Repeat these pattern rows until square is about ½” shorter than you want it to be. Knit 3 rows in garter stitch. Bind off.