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.