This may be the winner for our family's very own tartan. I have tweaked it and stuck it back in the refrigerator for several months now, but have finally reached the point where I don't feel the urge to change anything when I look at it.
It started with admiring a soft bluish green tartan seen at a Games last June. Symbols include the crosses of St. Andrew, St. David and St. George with a green field for St. Patrick, and a bit of both (US) Air Force and Navy blue.
It may be still quite a while before it is actually woven (awaiting funding from an as yet unidentified source).

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