It is often said that "Necessity is the Mother of Invention". I beg to differ. I think fluke luck more often has a hand in new inventions. Take this fancy, colorful cast on for example:
I "invented" it when I went directly from a Provisional Cast On to a K1, P1 ribbing. Although as a provisional cast on for K1, P1 ribbing it sucked (too hard to pull out the waste yarn when necessary) it does rather well left in as a contrast color cast on, no?