A lot of those look like perfect sizes to wrap around hexagon templates for EPP! (I don't want them, though, I have plenty of my own!)
I like to slice my scraps into strips that are 6.5 inches wide by whatever height they end up (trimmed to be straight, if necessary). I make 'stacked coin' type strips and use those for scrappy quilts. Those strips are great to have by the machine for leaders/enders. It seems like the quilt just makes itself when I do that.
And I do foundation-pieced crazy quilts on thin muslin; just about any size bit of fabric works for that. The oddest-shaped pieces are great for starting the center of the block out.