My Mom actually got this one from Real Simple, so all you organizing junkies who probably already read Real Simple probably already know this, but here's a great way to reuse two different things - empty tissue boxes and plastic grocery bags.
I'm a huge fan of the fabric tote bags for groceries and use them whenever I do my shopping. Despite that, I still end up with quite a few plastic bags. Rather than bring them back to the store to recycle them, I use them as garbage bags for our small garbage cans. I know that's nothing new, but since we have 4 bathrooms each with their own can, and one by the laundry machines, I needed a good way to keep the bags organized.
That's where the tissue box came in. I put the empty bags in the empty tissue box and put one tissue box in each room. I would refill them as I brought purchases to those rooms. The problem was sometimes I'd end up with an empty box and no bags. So now I have a 6th box in my kitchen cupboard. Now when I unpack things when I get home, I just add the plastic bags to the 6th box. As one box runs out, I swap it with the box from the kitchen, and start refilling the empty one. Problem solved.
Again this may not be the most exciting/enlightening tip ever, but definitely made my life easier once I thought of it. Since I've found so many, "why did I never think of that before?" tips on other blogs, I like to return the favor.