An institution I know has chosen the following colors for its theme:
It is used as a banner at bottom of web pages, and the first green is used as the main “institutional” color. I wonder: does that color palette belong to some well-know “category”, or is there any evident principle that lead to its choice? I know there are recommended ways to pick three or four colors (opposing or related hues; triads and tetrads; that sort of stuff), but this doesn't seem to be the case here. How do you pick six colors? Is there any other systematic ways to do so?