I discovered that Mother liked to look at pictures in magazines.  Turning the pages and commenting on the photos often kept her occupied for quite some time, both when she was living with me and during her early years at the nursing home.  Often the pictures would stimulate memories.
Here’s an interesting article, Art Cuts Through the Fog of Alzheimer’s, about museum programs, particularly one at the Amon Carter Museum gallery in Fort Worth, Texas.  I think you’ll find it interesting and inspiring.  It may give you some ideas for helping your Alzheimer’s patient.