The following are instructions for a border for a typical granny square. Many crocheters decide to do one large granny square instead of doing multiple and sewing them together. My personal goal was to come up with several designs that can be applied to a typical granny square.
Instructions Granny Square Itself
The instructions are for changing colour as indicated in the Christmas Granny Square Afghan as found on Yarnspirations. You can change colours as often or as little as you wish.
Note: Ch 6 at beg of rnd counts as dc and ch 3.
With A, ch 5. Join with sl st to first ch to form a ring.
1st rnd: Ch 6. (3 dc. Ch 3) 3 times in ring. 2 dc in ring. Join with sl st to 3rd ch of ch 6. (Four groups of 3 dc, four ch-3 sps forming corners).
2nd rnd: Sl st in next ch-3 sp. Ch 6. 3 dc in same sp as last sl st. *Ch 1. (3 dc. Ch 3. 3 dc) in next ch-3 sp. Rep from * twice more. Ch 1. 2 dc in first ch-3 sp. Join with sl st to 3rd ch of ch 6. Fasten off.
3rd rnd: Join B with sl st in any ch-3 sp. Ch 6. 3 dc in same sp as last sl st. Ch 1. 3 dc in next ch-1 sp. *Ch 1. (3 dc. Ch 3. 3 dc) in next ch-3 sp. Ch 1. 3 dc in next ch-1 sp. Rep from * twice more. Ch 1. 2 dc in first ch-3 sp. Join with sl st to 3rd ch of ch 6.
4th rnd: Sl st in next ch-3 sp. Ch 6. 3 dc in same sp as last sl st. 3 dc in each ch-1 sp to next corner ch-3 sp. *Ch 1. (3 dc. Ch 3. 3 dc) in next ch-3 sp. Ch 1. 3 dc in each ch-1 sp to next corner ch-3 sp. Rep from *twice more. Ch 1. 2 dc in first ch-3 sp. Join with sl st to 3rd ch of ch 6. Fasten off.
Rep last rnd, working 2 rnds each of A, B, C, D and E, until square measures approx 36″ [91.5 cm], ending with 2 rnds of any color. Fasten off.
Instructions for the This Border
This border reminds me of a side profile of a birthday cake. The icing sugar is piped on and being three dimensional.
This border plays with Front Post Double Crochet known as FPDC. It’s pretty straight forward once the idea clicks in your head. The border is about 2″ but you can make the border as thick as you need as it will continue to grow perfectly square, no matter how big you make it.
In the instructions, I will have you turn your project around after the first round as it’s easier to Front Post Double Crochet verses Back Post Double Crochet. But if you want to not turn and do back post double crochet around, then by all means… do what works for you.
Fasten onto to any corner space. Ch 3, (counts as a dc), 2 dc, ch 2, *dc into each stitch and space to the next corner. In corners, place 3 dc, ch 2, 3 dc in each. Repeat * Around. Join to the top of the ch 3. Fasten off.
Turn your project around so you are looking at the back aka wrong side. Fasten on to any ch-2 space in a corner. Ch 3, 2 dc, ch 2, 3 dc (corner made), *Front Post Double Crochet (fpdc) around each post o the next corner. In corners place 3 dc, ch 2, 3 dc. Repeat * around. Join with a slip stitch to the top of the beginning ch-3. Fasten off.
Continuing looking at the wrong side. Repeat Step 2 one more time. Fasten off.
If you want to make your border thicker, you can continue to grow the border with more rounds using the same instructions. Your afghan will stay square.