For my aunt and uncle's 50th anniversary, I made a donation to the Cancer Society, since my uncle was battling cancer. For another aunt's 90th birthday, I made a donation to our local library, which I know she is a big supporter of. For my godparents' Christmas, I usually bake them something special; breads, muffins, cinnamon honey butter, candy. They're in their eighties and they don't need "stuff". I think those are good ideas for gifts that "don't take up space".