I used different brands of mercerized cotton, and hook 3,5.
Slip stitch: ss
Half double crochet: hdc
Double crochet: dc
3 dc cluster: yarn over, hook in stitch, pull through, yarn over, into next stitch, pull trough, yarn over, into the next stitch, pull trough, yarn over, pull through all loops.
Start by chaining 3, join with slip stitch.
Round 1: ch 3, (I always only chain 2, but this is your first dc), 11 dc into the circle, join with ss.
Round 2: Change color, start in the space between 2 dc's, ch 3 (or 2 if you like), 1 dc in same stitch, *2 dc in next space*, repeat * to * all around, join with ss.
Round 3: Start in any dc of the previous round. Ch 3, make a cluster dc over the next 2 stitches (so you make a 3 dc cluster), *ch 2, start in the same stitch as your last dc and make a cluster 3 dc (look at the lower left picture of the above)*, repeat * to* all around (the last cluster will end where the first one started), join with ss.
Round 4: Ch 3 in any space in between clusters, ch 2, 2 half double crochet, *3 hdc into next space, 3 dc, ch2, 3 dc into the next space (making the first corner of your square), 3 hdc into next space, repeat * to * until you've formed a square. Join with sl. st.
Round 5: If you want to make your square bigger, like I did, just use the regular granny square pattern, so 3 dc into each space and a 3 dc, ch 2, 3 dc into the corners.
That's all there is to it! I think it's a nice and simple design, just slightly different. I hope you all enjoy this pattern! I know I have... And probably will.