I discovered this while doing the Daisy Picot Stars for my daughters wedding.
This works well with a variegated thread.the sample was made with size 20 Lizbeth thread in 115 springtime.
pull out 15" for the second shuttle thread, you can finger tat or wrap the thread onto a shuttle. This thread will be sh2 (you may need to take more off sh1 until you can get the color change where you need it.
ds = double stitch
dt = direct tat - do not flip
begin your pinch where there is a dramatic color change and finish wrapping your left hand.
starting with
sh1 1 ds
sh2 dt 9ds
sh1 2ds
sh2 9ds
sh1 2ds
sh2 dt 9ds
sh1 2ds
sh2 9ds
sh1 2ds
sh2 dt 9ds
sh1 2ds
sh2 9ds
sh1 1ds
if you have any questions you can ask in a comment or you can email me.