Hello. I looked into making the tumbling blocks quilt and also the grandmother's garden quilt without Y seams. They used the strip piecing method. However, it looks like you end up with a vertical seam going down the middle of the top of each tumbling block! I don't know if I like that. You don't have that seam when you use the traditional method with Y seams. I don't know what I hate more -- the extra seam, or making Y seams!!!