This Mosaic Crochet Throw seems difficult but is very easy in execution. Mosaic Crochet is very similar to Mosaic Knitting. You work one color per row, with drops (often called a long double crochet stitch) to the row of the second color to make the vertical lines. This is the easiest way to learn colorwork in knitting, and I think it is true for crochet as well. Enjoy! Link of the pattern is below!
Southwestern Mosaic Cross Throw
by Tara Sensenbaugh
Southwestern Mosaic Cross Throw Free Crochet Pattern downloadable pattern is available here.