3d-gradients of sky

When I shoot my panos and I stitch them with hugin, there are
sometimes some little "holes" at the border of the panorama, often in
the sky (or at the ground). I then just copy (in gimp) the sky around
it, shift and paste it. This looks ok, but not good; it would be
better to make a "simple" 3d gradient fixing say four points where I
know the colour of the sky and then the missing part is filled.
In the attached panorama example it is visible that I did the
copy&paste at the top left of the statue.
My question: how do you guys handle this problem?
If it is not a hugin related question and thus not to be discussed
here, please let me know as well.
Thanks
Thomas

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