Can one have too many colors?
Yes:

65,536 (256 x 256); all possible graduations of both Red and Blue, Green is completely absent. Best seen Full Screen.
If this view were to be replied another 255 times, incrementing the value of Green on every pass, we'd see every possible shade once.
256 x 256 x 256 = 16,777,216 colors, corresponding to 24-bit colour

Just a few years ago, so it seems, we should have been so blessed.
The entire number of colors - the dimensions of the palette - that may be shown on a monitor was just 256 in a time; 8-bit colour.
Web Browsers had to settle on a common palette, and embraced a set that has since been known as the 256 Web-Safe Colors.
These colors could subsequently be exhibited without dithering in most browsers.

216 of those are historically represented in a 6 x 6 Cubes arrangement, each cube consisting itself of 6 distinct colors:

WebColors_216. mq4 on Black. Download below, please.

Once the screen is up, it's totally static. RGB Codes can be reproduced to Graphics on the chart. The rectangles may be dragged, copied, overlaid, etc..
Start using Black, White and the neutral Gray (128,128,128) as Backgrounds, to determine just how that affects appearance and contrast.
That is no end of enjoyment for children of all ages however, as a responsible adult, you may wish to also look up things in the hyperlinks below;--RRB-

In the RGB colour coding system each component, Red, Green and Blue may take on a value between 0 and 255, for a total of 256.
By stepping through mixtures of those values different colors will be shown.

The step used for the 6x6 Cubes above is 51 (decimal).
For example, in the upper row, to purchase from Black (R=0, G=0, B=0) to complete Blue (R=0, G=0, B=255), B will carry on values of 0, 51, 102, 153, 204 and 255.
Many references to the 216 Web-Safe Colors utilize Hexadecimal notation, and also the same arrangement is found replied as 00, 33, 66, 99, CC and FF.

Just 8 of those 216 Web-Safe Colors are called as MT4 Web-colors, with others as Custom alternative.
Meaning a fair number of additional standard colors become available to be used on screen.
The only Option in the Input Box would be always to write Data to document in folder \MQL4\Files\Color Kit.
This CSV file will always have exactly the same content, and may be imported into a spread sheet. (Copy attached.)
Please assess Post #3 for some more pictures.

The next Links have information directly associated with RGB coding, the 216 Web-Safe 6x6 Cubes or MT4 Named Web-colors.
Some sites have additional content that will hook into using Hues, other classifiions and colour concepts.

The most logical presentation of various standard colors. Hex easy to follow, although just.
The step for your Basic Colors there is 11hex or even 17dec, giving a graduation over 16 elements:
WebColors - RGB Color Chart http://www.nikhef.nl/pub/computing/WebColors.php

By clicking on one of the Named Web-colors, all other colors can be understood on that background.
Useful for selecting stable colors accordingly:
HTML Color Names http://www.w3schools.com/tags/ref_colornames.asp
The website was well reworked since first mention here.

Great presentations of coordinated colors:
Hex Hub HTML Color Codes: Hexadecimal codes for named colors utilized in HTML page contains
http://www.december.com/html/spec/color.html

The MT4 named Web-colors closely correspond to those 147 colour names defined by the Scalable Vector Graphics (SVG) Specifiion:
http://www.december.com/html/spec/colorsvg.html

The 6x6 cubes, but also a nice Choice of Secondary/Mixed/Pastel Colors:
Complete HTML True Color Chart; Table of color codes for html documents
http://www.immigration-usa.com/html_colors.html

The Web-color palette Used in MT4, but grouped by Hue, exceptional:
Color Names http://html-color-codes.info/color-names/

And http://www.visibone.com/
With, as much else, this superbly laid out 216 Web-Safe Colors Palette:
Website Designer's Color Reference Poster by VisiBone http://www.visibone.com/color/poster4x.html
Also, useful info and links regarding Colour Deficient Vision http://www.visibone.com/colorblind/

Please have fun.

Downloads:
https://www.cliqforex.com/attachment...6209677744.mq4https://www.cliqforex.com/attachment...966386883.xlsx
More on this mq4 in Post #4 and up. Please receive the User Info to go together:
https://www.cliqforex.com/attachment...0181554857.mq4https://www.cliqforex.com/attachment...3163274704.doc
Note: The spread sheet MT4 Custom-Basic Colors.xlsx first discussed in Post #7 was finished with colors named.
See Post #18 for details. Download is from Post. phew.

The Script mentioned in Post #8, MT4 Named Web-colors. Mq4, has been updated and become more interesting.
Description and download from Post#15.

Updated with a far more functional Grid and Cross Hairs combination. Details about this in Post #26
First of a string. Walk-through coding/drawing/coloring. Read from Post #11 up:https://www.cliqforex.com/attachment...1357395869.mq4https://www.cliqforex.com/attachment...1022082377.mq4
New: 00c Copy-Paste Functions.mq4 . How To. Importing graphics functions that are basic, and also the minimum needed to work them.
Up and coding in moments flat. Download from Post #13.

Practical Color Wheel Mixing. Description from Post #21 up.
Updated: Better usability largely. Presentation and details in Post #35

I've changed the blurb here a few times, but understatement goes just so far.
This one is 100%, because it could not be simpler and one has to do it all. Play school.
Also, looping the grey scale.
https://www.cliqforex.com/attachment...0743379232.mq4