These Blocks were easy! A friend told me about a fun way to cut and sew these with no templates, little measuring, and great accuracy.
Start with two contrasting fabrics that are just larger than the finished size you would like your block to be and press them right sides together.
Trim them to the size of your finished block
Cut a Post-It to 1/4 the width of the fabric. (1.5" for a 6" block!). Begin stitching at the Post-It, stitch down one side, turn at the 1/4", and continue stitching the 2nd side to the end.
Repeat this for sides 3 and 4.
Slice the block diagonally where stitching intersects.
Stack one triangle exactly on top of the other. (Each with the same color facing up)
Without moving the stack, make two cuts the same distance from corner edges as your Post-It.
Open all your pieces, press seams and arrange.
Join in three rows, then sew rows together matching intersections. Your block will look like this yellow one and will need those corners trimmed to finished block size.
Here are my blocks joined, as they are now on my design wall. I have a great multi color batik for the back and binding, and I am considering a wavy border:-)