Below, I took one of my basic shawl patterns, Terrific Shoulder Shawl (found on the linked page) and the "what if" question was, "What if I increase every row at the center back?" I wondered if it would make the sides longer, since it would be growing quicker, or if it would take the point longer down the back.
I also increased at the ends at a quick pace, every row, so the front grew quickly, and threw in some rows of *K2tog, yo* repeats for a lacy look. I used a yarn, that was comprised of several strands of yarn from several different balls of yarn. It was all cotton and made yarn weight of heavy worsted to bulky. I used a large needle, Size US 13 (9 mm). I love the look of this shawl.
Ok, here is the surprise shape of the back. :)
So, now we know the answer to my "what if." Have a great day!!!!