How do I paint a wall?

For example, I choose the default boring first aid building. I add some scenery on top of it, a special effect, etc. Now I want to paint it and make the building orange. However, for the life of me, I can NOT find the option to paint! I'm sure I'm just being stupid and missing a very obvious option or location but it's driving me batty. Any and all help would be appreciated, thanks in advance!
 
I don't believe you can "paint" walls but some walls have the option to change the colors. Also, if it's ugly, just throw some props or ivy trees on it. Hope this helped. :) Keep on building friend.
 
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