If you are using just two colors it's very easy to just crochet over the unused thread and pick it back up again as the last YO and pull the loop through in preparation for the first stitch of that color that follows. I'm making a Guatemalan Tapestry that way right now. But it will add a teensy bit of bulk to the item you're making. This page may help

Here is a link that might be useful: carrying yarn

donna thanks for that link I never thought of bringing the new yarn up like the illustration. I'm going to give it a try thanks again
after all these years lol