for this technique you will need-
water color pens for adding details
brush for applying paint to thread
-take out the thread ring so formed from your fingers gently
-take another piece of thread and tie a knot at one part of the ring as shown in the photo, so as the ring so formed is not disturbed.
-with the help of scissors, cut the thread ring exactly opposite from the knot, refer photo
-align all the thread parts together, as shown in the picture
-with the help of brush apply your favorite color to the thread, this part is little messy.
-now you can print/ stamp the colored thread on the paper. you may need to apply some pressure with your fingers to get proper print.