I'm currently having a spring cleaning urge and used the weekend to sort things to donate, sell and get rid off, and start re-organizing everything (good thing I don't have too many possessions!). I have a bad habit of putting things in boxes when I'm tidying up, and I rapidly ran out of boxing supplies, especially for little things. I did a little search for a box template and stumbled upon this custom box template generator.
You can pick between two box designs and an envelope design and enter your own custom dimensions (length, width and height). A PDF file is automatically generated! It does the math and all the drawing work for you- just print, cut, fold and glue! It will only work for small objects unless you have a giant printer, but still, how handy is that?