It seems that at this time of year, we're up to our eyeballs in boxes. We're receiving packages and sending packages and wrapping up gifts in boxes. I think, the majority of the time, when we're done with these boxes, we should either offer them up on Craig's List for people who are moving or just recycle them, but it can be helpful to keep a few boxes at home too.
As someone who has always lived in small spaces, one of the most convenient places I've found to store boxes is under the couch. Many of us are already storing things under our beds, which tends to have a little more clearance, but there is a lot of floor space under your couch too. It's not a very high space, but if you flatten your boxes, you you can fit quite a few under there.
I tend to keep mostly medium sized boxes, which I find are the most versatile for moving, holding donation items, crafts, and, of course, sending packages.