you might have noticed -- F18 wallpaper was finally set as default (in
F18) so I made a blog post  and already have a rather good feedback.
To summarize for those who do not want to go through all the comments:
* Best fedora wallpaper since at least the Solar one (I'm inclined to
think so too ;-) ).
* A little bug in the bottom right corner -- "darker vertical overlay
117px wide at the right side of the wide wallpaper".
* There is (at least) one person interested in tutorial/pointers on how
to make such wallpaper -- is there anyone who'd like to write it?
I'll continue to monitor the comments and post a summary in this thread
again if anything new appears. :)