I just finished the 10th square - one of my own design.
I wanted to do a square with lots of bobbles. I used my new "Cables and Arans" book from Interweave Press and selected three patterns with repeats that are multiples of 8.
I cast on 59 stitches. After the three ridges, I increased 10 stitches on the next right side row for a total of 69 inches. On the next row, the wrong side row, I did row 1 of the 'Cable and Dot' pattern in the center.
The center pattern is called 'Cable and Dot' and is found on page 82. It has a 15 stitch pattern with a 24 row repeat with row one starting on the wrong side.
The one out from it is called 'Cable with Bobbles' and is 9 stitches wide and has a 12 row repeat from page 50.
The outer pattern is 'Alternating Bobbles' and is 6 stitches wide with a 16 row repeat from page 189. I started the one on the left side at row 9 to mirror the one on the right.
So to create the right length square, and for the repeats to end in a good place, I needed 72 rows after the 6 garter stitch 'three ridges' rows. Thus creating 3 repeats of the center pattern, 6 repeats of the Cable with Bobbles and 4.5 repeats of the alternating bobbles.