Surely this means that the person who you are buying for has everything, so difficult to decide what ?
Well, there are charities who in turn help animals to survive. Why not adopt an animal for them ?
http://www.orangutan.org/how-to-help/foster-an-orphan-orangutan
http://www.wwf-adopt-a-animal.co.uk/charities/wwf-animal-adoptions
http://www.bornfree.org.uk/give/adopt-an-animal
Inturn, the gift may actually change the person, in presents they give in the future.
This is where you can make a difference.