This is interesting.

• America does not have an official flag theme, but countries like the UK (127 users), Mexico (30 users) and Canada (59 users) have theirs. Even Venezuela has one with a single user.
• Puerto Rico has two themes, though the second is named "Puerto Rico 3". There's no flag for California, Texas, or DC.
• The most popular official flag theme is Flag India 2, at 261 users. An additional 29 use Flag India
• The Palestinian flag has not one, but two official flag themes, totalling at 49 users
• The Israeli flag has a theme and six people use it
• Tibet does not have a flag theme, but China and Taiwan both do
• Russia (3 users) and Ukraine (21 users) are both represented
• South Korea is only Korea
• There are two Iran themes. Flag of Iran is a neutral tricolor without any emblem in the middle; Flag of Iran 2 uses the flag of the Islamic Republic of Iran with the emblem of the Republic in the middle. No love for the monarchist lion and sun.