I had scrap fabric left over from some plain, white cotton curtains I made for the bedroom, so I cut it into squares and zig-zag stitched the edges with bright colored thread. Voila, handkerchiefs!
I have allergies, so I sneeze and blow my nose far more than is ideal and I felt like it was awfully wasteful to constantly be using TP or kleenex, so this will be better for my conscience and my snoot.