My parents seemed to save everything. I found this old paper, which I seem to remember was called onion paper. It was used back in the days of the type writer, even before the electric one. Not being able to just recycle it, I thought that a double envelope might be fun.
Step 1. On the inner layer, I wrote the first names in a dark(ish) color. I tried to think about the layout of the address and stamp while placing the names.