Oh, and scrapbooking! It's very popular with people of all ages. They could use bits of felt and buttons and other scraps, and they could decorate the photos their family gives them of their grandkids or whatnot.

If you're allowed to bring animals, you might also try bringing a friendly dog or a calm cat from the pound so they can have a pet day where all they do is pet the animal(s). It's been known to have a positive effect on hospital patients or other people kind of stuck in a similar situation, like seniors at a rest home. Lowers blood pressure and is good for the health and general happiness.