I recently came across the "time-saving" hint for making triangle pairs.
Take two larger (let's say 5") squares, contrasting colors.
Place them right sides together (or as one youtube instructor says: "pretty sides together").
Sew 1/4" all the way around all four sides.
Then cut diagonally from corner to corner twice. Open up to right/pretty sides out. Result: 4 half-triangle squares.
Sounds like a great idea. I just tested it out and found that I spent more time squaring the resulting squares. So I'm not sure I'm saving any time.
I'm always for time-savers, unless they require more time! ;-)