I told works4me that I'd do picts of this method. Here they are.
I was playing with these leftover pieces last fall when I should have been workin' on my DGSons's Solar System quilt. When DDIL gits pregnant again I'll use these blocks & the other scraps ta make a quilt for that child.
These are just picts of the pieces so you can see how they go tagether.
The first 3 picts are of blocks already made.
This one is already trimmed down.
These 2 are not.
Here is my center piece.
Cut 2 squares the same size as the center then cut 'em on the diagonal.
Find the center of the center piece & of the triangle & line 'em up.
Here the 4 triangles are laid by the center piece. As you can see, even discounting the seam allowance, they will be too big. You will need ta trim down.
Here are some other pieces.