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Well maybe we could base it on the flags of the three states which at different times came closest to unifying all Germanics. So that is the Kalmar Union for the Scandinavians, Holy Roman Empire for the German-speakers and Dutch and St George's cross for England and Lowland Scotland.
I'd combine them into one flag like this:
Yellow from the Holy Roman Empire and Kalmar Flags, Red from the England and Kalmar Flags and White from the England Flag (without the white it'd be the Kalmar / Nordic Union Flag).
Official meanings for the colour could be made up - with a lot of tricolour flags they make up some story for each colour - well do something like that.
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