I agree with Dunster...if they are stretchy - which is likely the case due to the bias edges - toss them in the scrap bin and use them for a paper piecing project.

Another great learning opportunitie!

Thanks Dunster! I made a quilt years ago with a triangle border and had a terrible time trying to figure it out. Haven't made one since but might try it again using the link you provided. I really do like the look when bordered on both sides with regular borders.

If the edges were stretched, I would wet them down with a spray bottle and smooth and press the edges. If that doesn't work, then toss.

Instead of tossing them, why not find a small square ruler that fits inside the pre-sewn units and cut half-square triangles for a different project. They may be smaller but still salvageable.

I agree. You should be able to use them somewhere else.

Thanks for sharing that link, Dunster.