Originating with sailors that wanted to make something nice for their girlfriends, netted lace began by using and experimenting with the basic net-knotwork in beautiful and delicate ways (i.e. finer linens rather than coarser netting-twine).
Generally netted lace is done in a circular fashion, with each piece displaying radial symmetry. Lace of this form is perfect as a "snood". However, there is no reason why it should not be created in a rectangle - as long as it's structurally sound.