Although the following instructions outline a process that sounds like it would make a pretty "ghetto" card box, the outside finish is very nice (as its mostly just picture frames with a foamboard lid), and I have heard nothing but compliments about it. (It has now been used in 3 weddings)
Step 1: Supplies
4pcs 11" x 14" Picture Frames (I went with black ones)
1 sheet of black foamboard (roughly 3' x 4'...can get away with less but that's the smallest size I could find.)
8pcs 3/4" L-Brackets
Glue Gun with sticks
Drill or Rotary Tool with a drill bit to match the screws that come with the L-Brackets
Screwdriver to match the screws that come with the L-Brackets.
4 Pictures to fit the frames
4 additional L-Brackets
Step 2: Construction Part 1
Once the holes are drilled, attach your L-brackets to connect your frames. Your goal here is to make a kind of box without a lid or bottom. (See diagram 2 showing outside view. Brackets are inside so as not to mess up the look, hence they are a dashed line...)
Step 3: Construction Part 2
Now that you have your foamboard pieces cut, you can begin gluing them in place. Start by pushing one of the smaller square pieces into place. It should site about 1 inch from the bottom of the frames. Glue the foamboard in place here from the top and bottom. (For added support, you can add extra L-brackets at the center of each side to help hold the bottom in place)
For the lid, glue the smaller square to the center of the larger square. The idea here is that the smaller square sits into the box to keep the lid from sliding off. Once this is done, finish up by gluing the handle strip to the center of the lid.
Step 4: Add Photos
Again, I apologize for the lack of pictures, and will update this instructable if I find a picture of my own box, or if I get my original box back.
Thanks, and I hope you enjoyed this build.