I am afraid that this is not possible. Our predefined icons are parts of the skins and thus if the embedded skins are disabled these icons are disabled as well, so the string you pass to the ContentIcon or TitleIcon properties will look for an image with this value. This is why you get the broken images icon, because there is no info or ok, or deny, etc image in the folder your page is in.
I can suggest two ways to work around this
1) create a notification that has the embedded skins enabled, show it, save the image you desire and use it as a file (you would need to edit it first, as both the content and title icons are in a single sprite)
2) If you wish to make only minor modifications to the skin you can include a stylesheet that will override the desired selectors via the !important attribute and still use the embedded skins. If you need this modification application-wide you could include it in a master page if you use one.
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