Ribbon Afghan pattern

This is a clever technique, using the various heights of the crochet stitches to create a ribbon pattern across the afghan (blanket/rug, choose your term!). From the blog, The Adventures of the Gingerbread Lady:

The Adventures of the Gingerbread Lady: PATTERN: Ribbon Afghan

				The Adventures of the Gingerbread Lady: PATTERN: Ribb... This afghan was something I came up with because I wanted a very quick and very easy pattern that could be done by touch - it's repetitive and simple, the perfect a...
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Pattern link (including a downloadable pdf): http://gingerschatz.blogspot.com.au/2010/10/pattern-ribbon-afghan.html

She shows a couple of examples inspired by her pattern here: http://gingerschatz.blogspot.com.au/2011/03/outdone-or-outcrocheted.html

Note: links are in US crochet terminology.