This will help you to theme all your settings icons, including Zephyr and AppInfo. Please be aware that some themes may use this method, so if there's already an info.plist in "Library/PreferenceLoader/Preferences/", then your settings icons are likely already themed, so there's no need to change the .plist.

1.) Copy the "info.plist" from this folder, to "Library/PreferenceLoader/Preferences/".

2.) Reselect the theme in winterboard, and re-spring. This will link that folder to a bundle in the "3 4 All" theme. You can add more icons to "3 4 All.theme/Bundles/com.Preferences.Settings/".

3.) When changing themes, you can use this info.plist and bundle as a template for theming other settings icons, or you can simply delete the info.plist when done.