Just like LEGO bricks, life is full of color! I've seen (and participated in) various debates about LEGO's choice of color pallete when it comes to "foundation" bricks, or bricks used early on in a build that eventually get covered up. I'm not creating this post to change people's preferences, but I would like to attempt to get rid of one of the arguments being used.
"It's not realistic" is a poor argument, in my opinion. In reality, it's a false argument because actual construction(s) have quite a few different colors.
Below are photos of buildings and houses that are all within 15 minutes of where I live. You can see gray, white, orange, green, black, brown, etc. all being used here, and everyone of those colors will be covered up with the final product. I personally took the photos of the bottom three construction sites.






These pictures of insulation I pulled from Google, but can be purchased at a local hardware store such as Home Depot. The colors are pink, yellow, white green and brown.





Below are photos of various building materials in different colors that I took at a Home Depot that's about 10 minutes from my house. These include different color pipes, wiring, wood, etc.







Comments
In addition, the gray concrete floors are only part of the story. Before the concrete was poured, it was steel beams, rebar and pipes. Chances of it staying concrete upon completion is probably slim too. There were be a variety of colors applied to the top (carpet, tile, wood, etc.). There are various different colors/materials that go into the product before it is complete.
You went to a Home Depot to take photos of building materials, so that you could post them on a forum about LEGO.
Can I have some of your time? You seem to be at a loss as to what to do with it yourself.
*I'm using the term meaningless in the nicest way possible. IE, anyone (including myself), reading/writing/talking about a plastic toy brick could be considered a waste of time since it does nothing to sustain a person's life.
If an admin were to pull all the site statistics about how much time people spend on the site, we'd see who the real "time wasters" are.