At Home Depot the gray color surface is tough and scratch resistant, one can pay $2.99 a sf and count on compliments + installation which is easy.

Contract (write sales price in bright green color pen across front)2.

Are the walls and ceilings to be painted the same color?  

Washington can't agree what color the sky is tomorrow. 

No matter what color the tile is - it will always be the superior flooring material.  

With the color of the bricks it would look a little drab and boring without it.

Martin Luther King approach, "I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin, but by the content of their character."

This might sound ridiculous, but is there any chance it won't look right when they move out eventually and it's painted back to the original color?

The protected classes of the Fair Housing Act are race, color, national origin, religion, sex, familial status, and disability.The guidance states that when a housing provider’s seemingly neutral policy or practice has a discriminatory effect, such as restricting access to housing on the basis of criminal history, and has a disparate impact on individuals of a particular race, national origin, or other protected class, the policy or practice is unlawful under the Fair Housing Act if it is not necessary to serve a substantial, legitimate, nondiscriminatory interest of the housing provider, or if the interest could be served by another practice that has a less discriminatory effect.

Peter's crew does very good work, both exterior and interior, and will help you with color choices.