This might be useful... I made a few boxes to put a small gift in the each box instead of using wrapping paper. I thought using a box + wrapping paper are just wasting.... The boxes which I made are small (2.5" x 2.5" x 1.25") but you can make bigger one. I used 80lb drawing papers and these were nice thickness to make boxes. Here is an instruction how to make a gift box.
If you want to use this pattern, please feel free to email me. I will send you a PDF file. (I just don't know how to attach the file to this blog, so..)