The holly and the ivy
Holly and ivy are traditional British Christmas decorations, probably because they’re evergreens, so they don’t look dead in winter. They were part of pagan midwinter festivals before they were subverted by Jesus’s crew and the lyrics of the traditional carol “The Holly and the Ivy” shows how the subversion worked:
The holly bears a blossom, as white as lily flower, and Mary bore sweet Jesus Christ to be our dear saviour.
The holly bears a prickle as sharp as any thorn, and Mary bore sweet Jesus Christ on Christmas Day in the morn.
And so on
You can see how tenuous this is so:
- Fervent Christians should eschew holly and ivy as Christmas decorations (way too pagan)
- Fervent non-Christian religious people other than druids should also eschew them
- Anyone with a relaxed attitude to symbols from other religions can go ahead and embrace them.
 Symbolically. Holly really does bear a prickle as sharp as any thorn so don’t embrace it physically.