I'm missing some images from the Coffee skin. Where can I download replacements? Thanks!
Usually stuff like that would be found in the C:\program files\ factory install location. Maybe you need to run the installer again to repair the instance?
Sometimes in older versions of New UI (I haven't played in the latest version much) some images would vanish when editing the skin. So I reckon the files are probably there in the installation directory and you should be able to browse for a new copy. But if not you could try a re-install as Jeff suggested. Or post back with what you find and what version (including patch numbers) of the version of RH you're using.
... or create a second copy of the skin with a slightly different name (Coffee2) and raid the images from that. They will be in the publish/skins folder.
Update - You may need to generate an output using the new skin before the images populate the local folder.
My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.