So many great ideas!
When my mom moved into assisted living (also with Alzheimer disease) I made her a pillow with each of us kids on it as adults, with an additional pic in the corner of each of us as kids. This was used as a decorative pillow in her bed, along side her body in the wheelchair, and when she passed away, was with her in the casket. I didn't have a pattern, just made it up as I felt would work best. The fabric for the pics was run through my printer, (there are many types of that printable fabric) I wish I had gotten a better picture of the pillow, the only one I took is a bit blurry, but should give you an idea of what I did. Since you need 2, the work you put into the pictures would be well worth it!.
The pillow was also a good conversation piece for company and caregivers that would be with mom