If necessary for your design, swap out bulbs where a different color is required. I would not recommend using the color caps in this situation, since the point of the light will be pointing straight out, and the color caps are to thick on the tips.
If you have extra lights left at the end, you can use blackout caps.
Start your ribbon weave at the base on the back side of the package. Do the weave all the way to the base on the other side and come back to the center. Then go to the side, all the way to the base, then back to the center and down to the other side. Come back to the center, an then finish the final side, ending up where you started.