I'm a bit confused about the logic of giving a Buddhist a present to celebrate a Christian festival but I know from personal experience that people do wish to do just that, and it's kind of unfriendly to try to stop them.
A suitable gift from a non-Buddhist to a Buddhist* could be anything that aligns with the core Buddhist principles.
Booze is clearly a no-no
, but a donation on behalf of the recipient to any charity working to alleviate suffering is a good possibility. My family tends to spend a lot on Fair Trade goods from the local World Vision shop at this time of year, too, because each gift gives to to the producer, to World Vision and to the recipient - quite a good multiplier effect.
Hope this helps,
* Or vice versa, of course.