On the Let’s Knit! Magazine website, this is available for free under the name “Sands Baby Blanket and on Rays of Hope it is called Easy Baby Blanket with Lace Option

Overview: A square baby blanket knit on the diagonal in garter stitch, with optional lace border.

From designer:

This lace border makes the easy blanket very special. Use the lace all around for a shawl, or on the top edge only for a crib or pram blanket. The blanket is our basic pattern. (You can use any wool and needles to suit, to give a soft drape.) This pattern knits to approx. a 24” square. It will always come square so the size is up to you.

Note: This pattern is for limited non-commercial, educational and personal use only.

Yarn requirements only state that you need 200g of DK-weight yarn. Yardage estimate here based on several common brands of DK wool.