This is very generous technique to those who can do it. The common opinion is that weaving with 2 needles is slower and more complicated but it is the easiest choice if you want a symmetrical pattern like on these drawings.
1)First of all draw a color pattern you are going to weave; try to make the drawing large and clear; 2)String as many beads as you need for the first row onto the thread with 2 needles; 3)Make the second row with one of the needles; 4)cross both needles inside an additional bead at the end of the 2nd row; 4)leave the needle you have just used and weave the 3d row with another, it should not too difficult; 5)weave the 4th row with the needle left and cross the needles inside the additional bead at the end of the 4th row in the same manner... Repeat until you get bored :)))
This is a narrow chain of white, transparent and silver beads:
Very simple-looking split necklace. One can do much better!