This sort of reminds me of all the photos I've seen posted from the queen's jubilee in London :) The red-blue-white falg in the Thai flag and the yellow flag is the Thai King's flag.
@traeumerlein87 - I actually don't think there is a particular reason, you see the thai flag and the king's flag everywhere here - as well as photos/posters of the king, guess that's just the way they like it :)