We also live in Indiana and are getting married in Colorado. Needing ten to twelve lamps also means that shipping completed 106mm2 lamps would be cost prohibitive. I need these lamp to be flat-packable and capable of being rapidly assembled. I also need the light to last for 4-5 hours. The LED will draw ~200mA, so two AAA batteries will power it @3V for about 5 hours. I had originally wanted to use coin cell batteries, but they wouldn't last long with this powerful diode. Once I knew what parts I would be using, it was time to design.
Step 1: Parts, Tools & Files
Bright LED http://www.adafruit.com/products/518
AAA battery holder http://www.radioshack.com/product/index.jsp?productId=2062246
3-d printed parts ---- I printed these, but they could be sent to ShapeWays or other service.
Hot Glue gun
solder iron or conductive glue
FILES & LINKS:
http://www.thingiverse.com/thing:78719 Derivative of Makerbots Lithopane that I've used. No border or hole.
https://tinkercad.com/things/6C7zxGfTRaP-litholamptop/edit TinkerCad File. Delete my picture and insert your own.
http://www.pixlr.com Web based image editor used to crop and reverse pictures. Use whatever image program you like.