Mom told me about an article she read in the paper and I thought you might like to hear about it.
The article was about an interior designer who is trying improve the lives of Alzheimer's patients by providing tips which are easy to implement and are low to moderate in cost. For example, to reduce bathroom accidents, paint the wall behind the toilet a color which increases the contrast between the toilet and the space around it. This is a very similar idea to putting the person's food on a colored plate.
The design company is called Design Prescription. You can read a about her suggestions in detail at her blog. Take a look at her work. It's very interesting.