We get new pj's for Christmas and that is our one present we get to open on Christmas eve. This is what I grew up doing.

The pj's are from mommy and daddy (or mommy since we all got some, even the in-laws living with us) and then the gifts on Christmas will be from St. Nickolaus.
Re: What are your Christmas eve/Christmas traditions?
LOL My mom and my MIL both do this. We will probably continue this too.
We always buy 1 special ornament each year... we never got around to it this year though.. but I did get Morgan her own and we bought special stockings this year, so I suppose that makes up for it
As for Christmas eve, one year we opened all the gifts and then Christmas morning was boring.. So no more openings gifts.. But we always order Pizza for dinner on Christmas eve.. We did that as a kid and I wanted to keep up with tradition.