all those sugestions are cool, I actually went to a party two years ago as God, with the name tag and it went down pretty well, even got to do the 'You're welcome' thing when someone said 'Oh Thank God'. twas fun. I'm going to a party tonight and was trying to think of a Buffy theme costume, so naturally I'm a sheep. Don't ask me how I got there but my friend is going as little Bo Peep so I'm her sheep.
other suggestions for you, pink bunny suit maybe like anya's, or some of the other people at my party are going as good fairy and bad punk/goth fairy, Crazy surgeon, Pirate, Angel(an angel not the hottest that is David Boreanaz) and a China doll with porcelain mask(guanenteedm to frighten me), so maybe you could get some ideas from them?