Originally Posted by MLIW
I cant see why not by more to the point why would you do it?? Surely a lot easier to buy a quality design pocket square?
Maybe he already has a shirt or tie with a pattern he likes. I think it's great that someone wants to re-utilize an item rather than just run out and buy something new. Easier does not always mean better.
OP: if you make a conversion please post up your results. I have never worn a PS but I have a few lower-end ties I no longer wear that might make interesting squares.