Gosh, I used to cut up my scraps into my lumber yard....1 x 4, 4 x 4, 2 x 4, etc.
Never failed when I found a project pieces were just out of size so I still put them in large bins and when I see someone needs scraps, I send them a box. And I use them myself for scrappy quilts and such.
I do however, keep 1.5" x wof and 2.5".
Gylene Fitzgerald has awesome pineapple templates and polygon plates for that size.
And 2.5 " well, we know there's always jelly roll quilts to do.
Like everyone's reasoning here.