Moss that can survive that atmosphere would be a real problem on my bathroom’s grout.
NASA has enhanced the photos to show them at an Earth normal light level. Frankly, I’m guessing that they’ve played with the images so much to make them interesting that without seeing the original, you don’t have a clue what it looks like in reality. Hint, it’d dark.
http://www.thelivingmoon.com/43ancients/02files/Mars_Blue_Bird_Color_01.html
Pot.