I've got some ideas!
First-
Narrow your experiment down to a small group of people such as elementary school children, 5th graders, seniors in high school etc.
Second -
Have your subjects look at a color and write down how it makes them feel
Third-
Put a blind fold on your subjects and have them touch a color and write down how they feel
Fourth -
Compare and contrast answers and repeat!
Hope your experiment goes well!
P.S. I think this experiment would fit better under biology or miscellienious, not physics!
