Search Press have recently published this book on an innovative colour technique.
Welcome to Waterfall crochet, a method that introduces a way to get the look of multiple mid-row colour changes without all the hassle. No more carrying the dropped colour across the row, and no more mid-row colour changes. This new technique uses chain spaces to form a lattice to work over. Colours are worked the entire row and colour changes are only done at the end of rows. For most projects, yarn is carried up the side and worked over when making the border.