I do believe I read a post where a faded JW couple had Christmas decorations on their house, someone snitched them off and ened up in an elders meeting only to get DF'd.
The elders will reason you're still a JW (since you didn't DA yourself) and will stumble an outsider, and or you do not believe the WTS is Gods orginization anymore. You can also be labeled an apostate for celebrating pagan holidays.
You can't say you have doubts (that you kept to yourself) because you've already stated a position contrary to the WTS. They will expect you to repent or get DF'd.....that is of course if you get caught. I'm pretty sure of this.