1- get on top of your neighbor roof,
2- take 2 pictures of the sky with some tree on the bottom of one of them,
3- use gimp to paste them and make a mix to get a continuous pattern,
4- use a paint filter to keep the photografic feeling from far and get a closer view with delicate details.
Here you got: a border fabric for a vintage pattern cocktail dress to invite the sky to your party!
(obviously, after the cocktail party print contest, I will take out the mock up)