Smitch- I read a while back that you wanted to find fake braces. Our DD made some for a nerd costume last year, and they looked awesome. This will sound wierd, but here's what she did...
Take a regular paper clip and straighten it,then curve it to fit the curve of your teeth (we did upper teeth only). Use wire cutters to cut if its too long. Wrap a bit of duct tape around each end (so it doesn't cut your gums). Then take a few earring backs (the kind that have 2 curls, not the barrel type). The earring backs will snap onto the wire. You can use pliers to pinch them in place a bit so they dont move. The flat part of the earring back lies against your teeth, and makes it look very realistic! They aren't super comfy to wear all night, but enough to get some good photos, etc.