As I do a project, I save all the odd bits. When I'm done, I play a childhood game with those pieces. The game came with different geometrical shapes of brightly colored wood and the idea was that you would make figures with them.
If I can make an interesting shape or figure with the odds and ends, I keep them. If the shape or figure is particularly interesting, I take a picture of it and include the picture with the odds and ends to be used later for something. I think I am collecting for a "something" " quilt.
Pat