The next possible flag may be... Kurdistan!

If you have never heard of Kurdistan, here are some facts:
The Kurds are the biggest ethnic group (35 million people) worldwide without an official state.
Most Kurds live in Turkey, but also in Iraq, Syria, Iran and Armenia. 600'000 Kurds live in Germany.
Kurds are not Turkish and not Arab, the Kurdish language is related to Persian.
The Kurds are the biggest enemy of the IS terrorists. With their Peshmerga, YPG and PKK fighters, Kurds fight effectively against terrorism, especially mentioned at this point are the female soldiers!
The autonomous region "Iraqi Kurdistan" has a thriving economy and is practically independent from Iraq.

Actual situation: Due to the the war in Iraq and Syria, an independent Kurdistan is closer than ever. The independence would be a deserved reward for a bloody war. A possible Kurdish state would include the already existing autonomous region "Iraqi Kurdistan", and maybe the Kurdish parts of Syria. A Kurdish state on Turkish or Iranian ground is rather doubtful. The capital of Kurdistan would be Erbil, actual capital of Iraqi Kurdistan

The Kurdish anthem: https://www.youtube.com/watch?v=FrxxC53SuuE
A actual song from the "Kurdish shakira": https://www.youtube.com/watch?v=G7kFtvwd4Po
A flag from Kurdistan would look like this: http://s29.postimg.org/scdyzbovr/kurdistan.png