That's a cracking bit of sky.
Just waiting for the right bit of landscape to drop it into.
I collect good sky shots so that I can repair shots where the real sky has burned out.
If done sympathetically it's a very useful technique.
No mate, that wasn't what I was saying.
I wouldn't use someone else's shot, that wouldn't seem right.
I was suggesting it was the sort of thing you could do.
If you have a shot with a burned out sky. drop that shot in as a layer, blend it with the darken mode and then just mask out any areas that don't look right.
It's usually a five minute job.
If you post up a shot that needs a better sky I could show you.
For best results it should be a shot lit from the same sort of direction.
Always possible, I'll give you a shout if I'm down your way sometime.