The following Automator workflow will:
- Archive your old "Wallpapers" folder
- Download the xml of an rss feed (Only tested with deviantart rss feeds)
- Get all the links from that xml file
- Download any linked-to images from those links
- Place them in the wallpapers folder
In the following guide, each step is shown as Library » Action; drag each specified item to the work are on the right, in the order shown, and apply any changes as noted.
- Finder » Get Specified Finder Items: Specify your Wallpapers folder, which must exist prior to creating this workflow.
- Finder » Get Folder Contents.
- Finder » Move Finder Items: Specify your Archives folder, which must also exist prior to creating this workflow.
- TextEdit » Get Specified Text: Enter this text in the text box for the action:
http://backend.deviantart.com/rss.xml?q=boost%3Apopular+in%3Acustomization%2Fwallpaper+max_age%3A24h&type=deviation
- Safari » Download URLs: Set the Where pop-up to your user's home folder.
- Automator » Run Shell Script. The contents of the script (Shell = /bin/bash, Pass input = as arguments):
cat $1|grep link|awk -F '<' '{print$2}'|awk -F '>' '{print$2}'|grep -v search rm $1 - Safari » Get Image URLs from Webpage: Set the pop-up to 'linked from these webpages'
- Safari » Download URLs: Set the folder to your same Wallpapers folder.
[robg adds: I tested this one, at it works as described.]

