How about some fuzzy dice for
Vegas wedding favors? Tacky, I know, but really you're having your wedding in Vegas, and it's all about the fun, right? You can give dice keychains or even actual dice. Get some from the gift shop at the casino. Put them in a little gift box that says: "Take a chance on love". The perfectly tacky Las Vegas wedding Favor!
There are also places online that offer personalized dice. You can have real dice to give to your guests, and you can have your name and dates put on them so that they can remember your special occasion. You can also have them made in custom colors to match your wedding colors. They don't have to have the typical 1-6 dots on them either, you can have different things printed on different sides if you like. Just be aware that if you are getting custom dice you may have to order a large amount to keep the prices down.
If you look at places that sell promotional items you can find almost anything you want printed with your custom dates, names, or whatever. Again, your minimum order might be large to keep prices down, but if you have a lot of wedding guests that can be to your benefit. Don't necessarily look at just wedding places, look for any places that has promotional items for your and use your imagination to create your own Vegas wedding favors.