##Python 2, 70 bytes

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    for _ in[0]*22:print"\x1b[34;1mF"*26+"\x1b[37;1mF"*26+"\x1b[31;1mF"*26

Uses ANSI escape codes to print colored characters to STDOUT - I chose "F" for France. No online link because ideone doesn't support ANSI escape codes in output.

Screenshot from xterm:

[![flag][1]][1]


  [1]: https://i.sstatic.net/7Hk6u.png