I downloaded a placemat/runner pattern that said it was "easy" for beginners, and I consider myself an intermediate/beginner. It consists of a trapezoid shape, two rhombus shapes put together to form a chevron, and squares that attach to the chevron and trapezoid, and they all go together in a pattern. I was very careful measuring the pieces making sure the size was correct. The shape pattern was provided to use for cutting. I made sure the seams matched on the squares. When I put it all together the diagonals on each side of the center were way off.
I've made four quilts but they've been strips, squares, and log cabins. Now I'm hesitant to try different shapes.