babblingbrook wrote:
I am talking about pictures I can access thru iPhoto and downloaded ones from Facebook, etc.
If you have chosen iPhoto or some folder as a source for your desktop pictures, the only way to remove individual items from the choices you see in the System Preference is to delete them from iPhoto or from the folder they currently are in.
If you just want a particular selection of images to appear in your choices, copy them to a newly created folder somewhere in your home folder (a folder named something like "Pictures for Desktop" is a good name & the "Pictures" folder in your home folder is a good location). Then choose that folder in System Preferences & you won't have to sort through anything else.