this is one of the simple thread art design card. in this i have tried making some design using triangle shape.
for making it we need
-silk thread (normal thread can be used)
-pencil, scale and compass for drawing triangles
draw triangles (i have drawn 3. you may draw one or two)
now including the end points of triangle, draw total 11 points on every side of each triangle. (for that i simply draw a point at the center of that side of triangle and then put 4 points in between center and end point of triangle- at both sides)
use needle and make holes on drawn points
take a silk thread and pass it through needle and tie a knot at one end. make sure that knot is big enough not to pass through holes.