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Themes and Permissions 
You can assign permissions for themes. You can only assign permissions for entire folders containing themes, but not for individual themes.
Themes are available in the Portal Catalog, but cannot be created or changed there. See also Working with Portal Themes.
In contrast to other Portal Content objects, themes have a fixed repository in the Portal Catalog. That is, they are in a specific folder from which they cannot be moved to another location. See also Themes in the Portal Catalog.
Themes are used primarily to maintain permissions in the Portal Catalog.
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Create themes and store them in the relevant folder in the Portal Catalog under Portal Content ® Themes.
If you want to distribute theme administration across multiple administrators, you can create additional folders below folder Portal Content ® Themes, store your themes there, and assign permissions for the theme administrators for these folders. In this way administrators can access different themes.
Launch the Permission Editor with System Administration ® Permissions and assign permissions.
For more information see Portal Permissions.