So, here's my tutorial, and if you read it thru, you'll see what I mean.
For my project, I started with 5" x 7" rectangles. Then I matched them up into pairs.
Place each pair right sides together, and draw a diagonal line on each pair. If you want all you pairs to be identical, draw all the lines the same. If you want to be able to form a diamond with your HSR's, draw some top left to lower right, and some top right to lower left. (This is the part I forgot!)
Cut along the drawn line. Take them to your ironing board and press the seams open. Go back to your cutting board and true them up to 4.5" x 6.5".
I haven't stitched these together, but you can see how you can turn them to get different looks.
This is my "cheat-sheet". If I want to make diamonds I need to do half one way and half the other.
May your bobbins always be full,