With your expectations of hat being a landlord is, you would most defiantly be shocked of walk into my properties and see the vast majority have color (beautiful clean lines) on the walls.

If you want to stand out, is it better to just use white or a different color?  

I created my own custom Google Map (https://www.google.com/mymaps) and I am drawing a boundary around each neighborhood by color and labeling with the date I drove the neighborhood.

Ask to buy them a cup of coffee, a beer, lunch, dinner or ice cream...doesn't matter.

I'm going to write a letter to the property owner letting them know my new mailing address (PO box this time), what colors I used on the house and throw the idea of buying it from her. 

It is black in color, but the intensity of the black can vary depending on how thick the mold has grown.

2) User wants to put in an offer, How is the network of computers in China/Africa/Texas/Toronto/London going to assist in determining how the roof is, the color scheme and styles in South Florida vs the patterns used and kitchens in Southwest Detroit?

What kind of doors (6 tabs/2 tabs) what color of interior walls, what type of countertops (Granite/laminate)...

The one other thing I can think of is to get some pops of color in front as well.

Find a friend or relative who owns property who's willing to let you try your hand at a super simple project, like cleaning out the trap under a sink or replacing an electrical switch faceplate with one in a different color.