So, Flags Why not?
You could wear them as PFP because you are supporting your national team at some sport event, because you are celebrating a national holiday or just because you love your country!
You could collect all those flags of countries you've visited or dreaming with visiting.
Or maybe you could just grab them all to make your favorite one be on top of the rank.
Why Checks ?
Because I've got inspired by them and the canvas created by Jack Butcher's which is "simple" and just perfect to enlighten whatever do you want to show on it... in this case all these beautiful flags!