There's the star afghan in Knitter's magazine Summer 2008
if she wants to knit it
free crochet one at
http://project-angel-kisses.150m.com/roundripple.html
try a google search for round ripple afghan, likely you'll
come up with others.
If it's the gradual color change you're after then knit/crochet with 2 strands. Work with 2 the same color for awhile, then change 1 strand to the next color, and so on, unless you just use different gradual shades ofa color of yarn.

Trust me, the Mary Maxim pattern is exactly the same as the pattern in the link qiviut gave you.

As an aside, I have been hoping someone would come up with the knit version and was delighted when I got the Summer 2008 Knitter's issue. Can't wait to try this one.