I made these simple handkerchiefs recently for my hankie-toting dad. Best I can recall, they're the first handmade gift I've given him since painting a rock in his image complete with sunshine yellow hair and a black-red slash mouth back in my kinder years. (Dad's hair was black at the time, but the black and red had run together, so obviously yellow was the next logical choice.) That rock was an overwhelming success. I know that because it still resides on his office desk.
These handkerchiefs are simple 16x16-inch squares with a 1/4 inch hem. One new technique I tried out was to sew along the raw edges half an inch in using my machine's seam guide (making what would become the new finished edge) before turning the hem. Doing so made my pressed edge much crisper and saved me from all of the precise measuring and marking that typically go along with hemming.