Ok... so I stumbled upon a really great looking downloadable video by Lily Chin in which she shows her mosaic crochet techniques.  The afghans and stitches she shows really look amazing, and once you realize just how easy it is you wonder why you didn't think of it first.. hahahah..... On a negative note... for us South African's, the download is quite expensive..and to be honest.. I was expecting a bit more.  It's great for a beginner... but for intermediate and expert crocheters..it can get a bit drawn out.  That said.. it opens a host of possibilities and you can really let the creative juices flow and design your own patterns.  The link to this video:  http://www.interweavestore.com/Crochet/DVDs-Videos/Crochet-Me-Workshop-Mosaic-Crochet-with-Lily-Chin-DVD.html

Here is a sampler I made to try out one of the patterns.  On an afghan this would work great!!!  Apologies for the quality of the photo....