Originally Posted by quiltmouse

Good News: no y seams.

The center star is an on point square.

The snowballs are square

The joins between are rectangles.
Cut the trapezoid (white)
add the purple triangles
make four: put two pale green triangles on medium green diamond
sew two to (opposite sides) trapezoid
put brown triangle on the other two diamond block, sew them to the trapeziod.
Rectangle.