Our extended family has always exchanged gifts with each other. One Christmas years ago, without any warning or previous discussion, a sil decided to give donations to an area zoo in everyone's name. We received from the zoo a handsome Christmas card with a photo of a manatee and its life story.
I couldn't decide how I felt -- like a spendthrift for daring to spend money on family members' gifts or like a spoiled kid who was mad because he got rocks in his Christmas stocking. Actually, I think my biggest problem was that there had been no discussion about this during wish-list exchanges. And I really do like manatees...
So if you're planning to drastically change your gift-giving m.o. tell everybody involved.