This thread is now about Aya Hirano-sama.
j/k
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The use of the sky is one element of Sola that dragged me into the show. And the way it is presented in the first episode is great, where Matsuri continues to long to see the blue sky.
If you're looking for photos of the sky(or any photo for that matter) you can try,
http://www.sxc.hu/
(need registration to download, but they have some high res, high quality images)