I have a bin where I put leftovers. After a year of picking through it for pieces for small/other projects, I put on a long audiobook and cut it all up into predetermined sizes, then throw the remainder away. When the pre-determined size box is full, I make something from it. Currently, two projects - a zig zag quilt and a Lady of the Lake from leftovers over a decade.
If you are not a scrap quilter, my suggestion is to find out who locally wants your leftovers. There are lots of groups who make charity quilts and would love your leftovers. Then you don't have to deal with it and they will have a treasure trove.