I have seen quilt blocks put together with a serger. They made an adjustment to the seams, and then sewed them together without using the cutting blade. They tugged on them and then the seams kind of "open up" so that they layed flat. It gave a decorative look to the seam lines, as you could see the thread, it kind of looks like a narrow sashing.
It is also a nice way to finish the edges of quilts before you turn them, using the birthing/pillowcase methods.
Please feel free to ask any questions here :D:D:D