Suggestions- begin with the enhancing the general environment, focusing on accessing long term memory and thinking about all 5 senses:
*famous art, plants/flowers, nature images, change the light levels with lamps/opening and closing blinds at different times, go outside for 'nature walk'
*aromatherapy oil ( out of reach on a paper towel is fine ) baking smells, herbs, fresh air, decaf coffee
*musicals, entertainment program, sing-alongs, periods of quiet/calm, eliminate 'confusing noise' such as background radio/tv, water fountain ( or sound machine )
*fabrics, hand massag