I've seen and been asked to many times can I paint the inside of my apartment as different color?

The Quick Recipe We Used in Our Kitchen-Light Quartz Countertops-Porcelain Mosaic Backsplash (in a complementary color)-With Dark Wood Shaker Style Cabinets (for contrast)-A Fabulous Shiny Faucet (for pop)-Color Pendants (for more Pop)-Stainless Steel Appliances-Vinyl Floors (yes, vinyl!)

it doesn't matter what color they are.

She and her husband bought at the height of the market thinking the only changes they had to tackle were dated floral wallpaper and paint colors. 

I like neutral colors myself but in the pictures the colors in this apartment seem pretty, well, blah.2.

A very popular color is java, and application is easy (wipe on/off).  

Patch and paint wholes..maybe paint whole house neutral color if they have funky colors6.  

I would not recommend doing the design part yourself unless you are extremely familiar with current trends, picking materials, coordinating colors, understanding product specs, and building code for that matter.

Infill with a new brick color to accent the house?

Looking at risk factors such as the type of tenants, evictions, vacancies, maintenance repairs, how they treat the place, etc. are all risks that aren't factored.Just adding some more color for those reading this.PS I own 4 houses in Indy and 2 in KC, so I'm speaking from experience.