This would be a great theme if your birthday party is planned for around New Years. You can throw a pretty big party and have a countdown to the moment you were born... or hour if you know it.
A new theme that I have thought up is a
Fire And Ice Party
. You can have a good vs evil theme, and decorate with sparkly ice like decorations and fire.
You could also pretend it?s the middle of the summer for a day with a: