Basic Instructions for Boxes of Strings
Foundation paper is 4 1/2" x 8 1/5"
Center triangle is 4 1/2" at the base
Cut a template for your center triangle (I used cardboard).
Trace the template and cut your fabric triangle. Center it on the foundation paper (I like to use a swipe of glue stick to keep it in place).
Add a light string to the right side of the upward-facing triangle and a medium/dark string to the left side. I placed a light string on first in each block for consistency. Note: I like my triangle points to float a little, so I don't lose them--my triangle point allows for this.
Continue until the paper is filled. All the blocks will have the same color orientation.
Assemble in columns; this makes it easier to match up your triangles into diamonds. Note that the columns are offset--one begins with an upward-facing triangle, and the next with a downward facing one, etc.
My quilt is 9 blocks wide and 20 blocks long. It finishes at 74" x 84".
My strings were from 3/4" to 1 1/2" (approximately) wide. If you wanted to do this with wider strips, you might want to increase the size of the foundation and the template. Just keep the same ratios: the foundation should be twice as wide as it is tall (finished size) and the triangle base should be 1/2 the total width of the foundation paper (finished). [So, for example, you could begin with a 10 1/2" x 5 1/2" foundation, and the base of your triangle would be 5 1/2".]
If you make one of these, please let me know--I'd love to see it.
I am happy to provide these instructions free of charge, but I'd love at least a mention when you use them. :)