I save my scraps mainly for applique work, its amazing how often I find just the right sized piece needed. I often think about precutting but then remember about the applique stuff and I also thoroughly enjoy tipping my wheely bin full of scraps onto the floor to find a fabric that might be suitable. I usually do this when I am looking after my grandchildren aged 4 and 2, they love playing with the fabric, grabbing a handful and and throwing it up and letting it fall all over them, keeps them occupied for quite a while and they also love helping me put it all back in the bin after, we usually play a game of putting all the same color in at the same time. I usually finish with black, as it seems I am always looking for small piece of black to finish something of.