The second meeting I noticed he was using a different colored pen to make notes.

These kind of shingles are made to last 20 years, and being they are light colored, they won't be as hot either.

There are many options for color and sheen, but I would consider all other options first like siding and trim color changes and then lastly painting brick.

Held two open houses for each property, made color flyers, picked good weekends and placed signs everywhere with flyers in the tube daily.

I was thinking of getting a different color siding?

What colors and brands are you currently using for your rehabs and rentals?  

Guerrilla marketing: go to a printer and get brightly colored stock paper, I like limegreen or fluorescent red, stay away from orange which is danger colorCreate a one-page website called _________rent to own homes.

Background color based on status: Good idea.  

Personally I would be more concerned about those wall colors and wallpaper.

It will also likely help resale value or speed if you use a new color that is more in vogue if the color needs a refresh.