A red square

This one is pretty dodgy but I had to put my leftover red wool to good use, and learn how to make granny squares, thus 'two birds, one stone'. As a vegetarian, I obviously do not condone stoning birds. Is there another saying that means the same thing?

Two photos, one click.

Two prints, one stamp.

Two needles, one thread.

...not quite as simple, huh.