autochange wallpaper from a remote directory

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http://askubuntu.com – I really like how I can set wallpaper to change every 5 minutes or so. The problem is that I already got used to current ones and I want to see new wallpapers. I can search and add new ones of course but it seems too manual to me. So my question is are there any services which provide daily fresh wallpapers and how can I set my system to automatically download and use the new ones? p.s. There are always some lovely wallpapers in bing (HowTos)