my "larger" scraps are sorted by size 5", 6", 7" etc.
my "smaller" sizes are sorted by colors
I don't have bunches of scraps and a lot of them are from my mother, and hers are VERY organized. She even had a shoebox full of 1.5" squares, she used to make Cathedral Window quilts and used them for the centers...not sure what I'm ever going to use them for but just can't bear to part with them.