Here is one how to I found on making them.
1) Decide if you want to roll hem the edges or fold grosgrain ribbon over the edges. I prefer to fold grosgrain over the edges.
2) Cut two 12″ equilateral triangles of fabric. If you are going to roll hem the edges, add 1″ to each side to account for the hem.
3) Roll hem or attach grosgrain ribbon around the edge of each triangle.
4) Decide if you want D-rings on the suspension corners and/or a clip on the corner that connects to the hammock
5) If you want the D-rings and clip, then cut six pieces of grosgrain ribbon about 3″ long each. Fold in half so that each is a doubled-over 1.5″ piece. Slide one D ring or clip down to the fold of each ribbon. Sew each folded ribbon to a corner of the triangle so that the ribbon is on each side of the triangle fabric (ribbon – fabric – ribbon), and the D-ring or clip is captured within the loop. 2 D rings and one clip per triangle.
6) If you don’t want the D-rings, then cut six pieces of grosgrain ribbon about 4″ long each. Fold in half so that each is a doubled-over 2″ piece. Sew each folded ribbon to a corner of the triangle so that the ribbon is on each side of the triangle fabric (ribbon – fabric – ribbon).