I think children will follow the pattern that was set out for them from being little. I used to help my boys make plates of sweets, eg truffles or mint creams for their older rellies, and they loved the maiking and giving. We also made christmas cards, and I encouraged them to write thank you notes. (When they stopped writing thank you notes the presents stopped coming!! )
I always had it in mind to train my boys to be demonstrative, which they certainly are.
One year I drove my boys to a discount warehouse so they could buy me a birthday present, which we more or less chose together. After paying for it my older son handed the silk scarf to me in the brown paper bag, saying "happy birthday Mum", but I pointed out that my birthday was still several days away, and it would be nice if it was gift wrapped.
Off they went to their room, popping out to ask for paper and ribbon. Some time later they presented me with something that really did look like it must be a bottle, with the words, "here you are Mum, now you can spend the week wondering what this is"!!