[CentOS] Custom wallpaper on CentOS 7?

Hi,

I just installed CentOS 7 + GNOME on my Asus S300 laptop. So far 
everything runs very nice and smoothly, and I'm quite happy with it.

Curiously enough, I can't seem to be able to set a custom wallpaper. I 
tried various locations like /usr/share/backgrounds, 
/usr/share/backgrounds/gnome and /usr/share/backgrounds/images, but the 
images don't appear in the wallpaper selection window.

Any suggestions?

Cheers,

Niki Kovacs
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