cut long piece of thread and thread a needle on each end
string1 light bead & 2 dark beads , add 1 light bead and pass both needles throug

string 1 dark bead to the right needle and 2 light to the left

pass right needle through the secound light bead and pull through
repeat step 2&3 to desired length

making the corner
string 2 dark beads to right needle
string 1 light bead on left needle
pass right needle through light bead

continue repeating step 2&3
and repeat step 4 when time to make secound corner

finish making last side of square by beading 1 light bead,1 dark bead and then pass both needles through first light bead in first raw

square done

weave both needles through beads to the corner
string 2 beads through both needles

add the hook and thread needles back though the two beads

weave threads ends and cut extra thread.
you can do this with any size /shape beads