Thangles comes in a roll, enough for a huge quilt. Trace a few to try works wonders inexpensive, old technology great for learning to sew straight lines. I have problems sewing straight and it makes my quilts much better outcome..
Thangles is printed paper that comes on a roll, sew on dotted line, cut on solid. It taught me to sew a straighter 1/4 inch, when done, it forms 2 triangles sewn tog. no points to fear coming tog.
Also, you can have same idea for stencilling on quilt for border..
I love it, like teaching a 2yr old how to draw..