the Confetti pattern will recreate that look. i don't own the pattern, so can't say whether or not it replicates the method used for the quilt you have.
your quilt was made by piecing elongated hexagons around square centers. additional squares were used as spaces to plug in the holes between the blocks as they were sewn together. lots of Y-seams.
it's similar to a traditional grandmother's garden.
Y-seams can be a bit tricky by machine, but are very easy to stitch by hand.