My humble apologies. sir. I had forgotten that you are using LMDE and was advising you on the basis of the version of Nautilus that is installed in the Mint 10 Main edition. They are different in that, for one thing, the LMDE version does not
include the "Set as Wallpaper" option.
I did some more checking and find that the Set As Wallpaper function is enabled in Mint 10 because Nautilus-wallpaper is installed by default. I do not, at this time have an LMDE installation and cannot check if the function is in the LMDE repositories. I am not sure whether this app is compatible with the Debian base of LMDE since it is written for Ubuntu and many Ubuntu apps are not back compatible to Debian.
If you want to try it and it is not in the repos, you can get the .deb package herehttps://launchpad.net/ubuntu/+archive/p ... 4_i386.deb