I expect most Mature Mints know this but in case any of our newbie friends don't, Gnome have a great site for downloading Wallpaper/Desktop Backgrounds.
Go to http://art.gnome.org. I now have a beautiful picture of Tuscany, Italy as my desktop background. Very calming!
I have a hope that Clem some day will block posting in the announcements sections for other than moderators - I have suggested that, but I don't know how easy that is to implement
Edit// not block posting - but block new posts
Don't fix it if it ain't broken, don't break it if you can't fix it