OK, this is pretty hard

Picture yourself doing this.

Your a wizard, lost in a land covered in the soapy ocean and powdery bleak, gritty sand. The colours shine through your eyes. You don't like it. You have to blink. You decide, your going to do something. You do a bit of magic. Everyone in the whole wide world will only see one color, and the other things you will see will be the shade of water. What colour would you choose???