The arena changes exterior color, depending on which team is playing that night.  It's red for FC Bayern München, blue for München 1960.  At all other times, it's white.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/96463101@N00">Rudi Riet</a> from Washington, DC, United States
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/rudiriet/403987905/">Allianz Arena sign</a>