I'd have it done by a pro, you get the warranty, They can also do the surrounding Tile in the tub surround and on the walls if you don't like the color of those, It really makes a huge difference and to do it yourself is not that easy and it smells really bad.

I use a standard size colored postcard with black ink, and i supply them with the 'copy' that they put on the card, then send me a "proof" before going out to print. 

I have two colors in mind that I feel I have narrowed it down to (but open to others as well). 

For example , I have a great kitchen guy and he suggested a certain cabinet color and said this is what 80% of people are putting in these days (High end and low end).  

If you went and bought some paint  and painted the interior a color of your choosing that's not an improvement but a customization.

It is also important to recognize that most of the people who post here have myopic views that color any advice they offer and that even when they are trying to help, their advice may not be what you need in your situation.Lets take this away from manufactured homes for a moment to illustrate the point.Two years ago, a friend of my wife's got her interested in trap shooting.

We worked the numbers, and I helped them pick out paint colors, carpet, fixtures, and flooring.

If it's a stone tile, their colors are based on the slabs they came from. 

Have them leave at least 1 bundle of shingles so you have some for repairs and also will have the shingle manufacturer / color. 

Has anyone used the same color planks for the entire house??