IOTL, the British flag of Palestine was pretty lame:
http://upload.wikimedia.org/wikipedia/commons/thumb/3/33/Palestine-Mandate-Ensign-1927-1948.svg/800px-Palestine-Mandate-Ensign-1927-1948.svg.png
Red flag with the Union Jack in the canton, and a white roundel simply saying "Palestine" on it. The challenge is to improve that flag, to actually make it and unique flag of Palestine and not just something generic (without using maps, either).
http://upload.wikimedia.org/wikipedia/commons/thumb/3/33/Palestine-Mandate-Ensign-1927-1948.svg/800px-Palestine-Mandate-Ensign-1927-1948.svg.png
Red flag with the Union Jack in the canton, and a white roundel simply saying "Palestine" on it. The challenge is to improve that flag, to actually make it and unique flag of Palestine and not just something generic (without using maps, either).