Color affect opinion absolutely. Which could affect your return visitors, and most importantly conversions. There has been tones of research poured into researching color theory in advertising. Different colors induce different emotions and feelings. Different colors work better for different projects. Blue supposedly gives off an impression on reliability, calmness, and comfort. Green supposedly put of feeling of success. Reds and hot colors supposedly action colors, that put of feelings of passion and drive. Or so they say.
You'll see trends in different niches if you look. For instance, you could notice how a whack of the best converting women's weightloss offers have green/purple theme to their landers?
Color affects opinion most definitely
