I have classified Landsat images into five classes - A variety of Palm, Water bodies, built-up/open area, other vegetation and miscellaneous. I used GRASS GIS for the process and the final classified maps use inappropriate colors. Now as I have to assign appropriate colors to these classes I was thinking about existence of internationally accepted standards for such purposes.
As palm which covers only 10% of total area is the class of my interest(shown in yellow in the following screenshot) I want it to be clearly distinguishable in my A4 size paper output. In the most unlikely event of absence of standards proper color suggestions are greatly welcome.