Rainbow Afghan is 12 panels; the patterns is at http://www.ravelry.com/patterns/library/baby-circle-afghan

Navy & Gold Afghan is 10 panels, worked over 150 sts.
Yellow & Variegated Afghan is 10 panels over 100 sts.

The 10 panel afghans are worked like the 12 panel afghan, but cast on the desired number of stitches and short-row 2 sts every other row for the full width.