Pre-defined color picking in the node admin in Drupal 7
Like I said in my comment I'm having trouble understanding the actual question. If you want a user to be able to choose from a set of predefined colors and connect this value to a node of type article you could do like this:


Visit admin/structure/types/manage/article/fields
Add a new field of type List (text)
Set the widget to Selectlist and press save
On the next page under Allowed values list you then enter all your colors in the form key|value for instance Red|Red or Black|Black and then press Save field settings
In the next form you might set if this field is required or not and a default value


Now your users can select a color from a select list on the article edit screen. Not sure this is what you're asking for though.

Here is an example of what the user will see when editing an article: