On this one, you crochet over the top of the color you aren’t using. So on row one, you work 6 black while crocheting over the top of the navy blue and then 6 navy blue while crocheting over the top of the black while working in the (sc, dc) across pattern. You do that for 4 rows. At the end of the 4th row, don’t cut off the black yarn. Just ignore it.
For the next set of 4 rows, you work 6 navy while crocheting over the top of the light blue, and 6 light blue while crocheting over the top of the navy. After row 2, I pick up the black yarn that is hanging off the right side of the blanket to carry it up the side of the blanket. After row 4, I change back to black and drop the light blue.
Keep repeating this, and you have few ends to weave in by the end. You do have to stop and untangle the yarn from time to time, but that’s way easier than weaving in a million ends. 