My original idea was to make some kind of LED centerpiece. I was looking online and found that there are already many prefabbed setups to make LED centerpieces, but nothing really gave me the unique twist I was looking for. Finally, I stumbled upon the idea for edge-lit holiday cards at Evilmadscientist.com which linked me to the LED Throwie Instructable, which in turn led me to all the other cool stuff on this site. It was then that my idea for light up table cards was born.
Before delving any deeper, I'd like to give one cautionary note to anyone thinking of making these. Though they are fairly simple to make, (I'm not the handiest or most artistic guy in the world, but I still pulled it off), they are time consuming. You're getting married and there's a ton of other stuff you're worried about. You need to make sure you start the project early and leave only the last steps for right before the wedding so you don't find yourself in a mad dash to finish these the night before your wedding.
In the end, the payoff can be pretty cool though. Unless you're friends with one of the 150 or so people at my wedding, chances are your guests will never have seen anything like it before. It's definitely a nice touch and something that people will even take home with them and still look at until the battery dies out.
Finally, remember this will not be very impressive if you're having a very bright reception. For instance if your reception will be outside during the day, this won't really work. If you get bright enough LEDs though you should be able to see it decently well even in a normally lit room and it will look fantastic in a dimly lit or dark room (like when they dim the lights when everyone's dancing etc.)
OK, now let's cut to the chase...