About 18 months ago when I was setting up my new craft area I set aside a cube in my expedit unit and one of the large boxes that fit inside it just for scraps. Previously I was rubbish with scraps, it wasn't that I threw them away or was wasteful with the paper I just didn't really have a system for dealing with them. I tried putting them in baggies with the un cut sheets of what ever they went with which seemed like a good idea so that when I worked with a paper I would have some co-ordinating off cuts to hand but in reality it didn't work for me.
Instead I now have a large deep box and all my scraps get chucked into it. I then rummage through it for just the right piece when creating a layout or especially when card making. It has helped me move away from only ever using papers from the same range together and it has made card making much more fun as I was always put off by having to cut into a whole 12x12 sheet to make a card. Now I have plenty of options and feel very good about using up my scraps rather than guilty for "wasting" a sheet of paper on a card!