I have newly introduced Santa sacks (12 little £1 items from santa, usually classic toys like whistles, slinky, ball and cup etc...) and Befana stockings (stocking with toys in at the end of 12 days/on Epiphany eve).
I have kept the tradition of a room full of unwrapped presents, I loved it as a child and can't imagine Xmas without it but it seems to not be that common. I started telling DS1 that Santa brings the gifts we send him for this (as we had to sometimes buy things with him there) so the gifts are 'delivered by Santa' but paid for by 'mam and dad' (which helps explain why not all kids get the same too) lol.
Wrapped gifts go under the tree, I think we did have this as kids (gifts from family members) but the already open gifts were more of the BIG thing for us (that moment of walking into the room and seeing everything at once laid out ready to go) as kids. We wrap gifts from us and put them under the tree and all sit around to open them and I think for my kids opening gifts under the tree is the BIG 'Xmas day' thing.
Stockings weren't much of a thing as a kid, it was an orange, chocolate coins, nuts, and a selection box it was NOT from Santa and they hang downstairs on the livingroom doorhandle (would be fireplace but they never stay up)... we do stockings similar, mostly sweets with a few little novelties like keyrings, bubbles, stickers but its just tradition (tradition honoring St. Nick the real person) and nothing to do with Santa (the man that flys on magic reindeer).
Crackers are just crackers, we do them but I'm considering making my own from now on because they are getting crazy expensive, and it's ALWAYS the same stuff that no one ever uses.
Christmas eve boxes I got as a kid (well not in an actual box) it was PJs and an annual etc... I still do this with my kids and hate people declaring its 'new' its been around since just post WW2. My family that was born in the 50s and 60s all had Xmas eve 'boxes' and my mam handed down her childhood Xmas eve annuals to me as a kid.
I recently (like 2 years ago) started a 'beer' 12 days of xmas for my DH, every day is a different bottle of beer - it seems to be a hit.
I considered starting to do custom advent but honestly, I can't be arsed and think it will turn into a chore of buying tiny (has to fit in a little box) unnecessary things cheaply (with 24 they probably need to be like 50p or less or it will add up to loads) so the classic chocolate advent calenders you buy for £1 are staying as 'tradition' in this house lol.
Traditions I deliberately avoid... elf on the shelf, to be honest, I don't actually understand how it works but it sounds tiring so I don't want to start it and have to keep it up.