Document level theme filtering
Allow a document cell to filter the available themes in the ribbon theme gallery.
Some themes are not suitable for a particular solution. For example, you might want to prevent the user from applying some of the hand drawn themes such as 'Pen' and 'Pencil' to a completed process diagram or electrical layout.
Equally, where a solution's color logic relies on, say, Accent 2 being lighter than Accent 4, it would be great to be able to filter the available themes to just those that conform to that rule.
If the Document ShapeSheet carried, either a specific cell or some User.msvAllowedThemes style cell, then the solution designer could include the desired built-in theme ID's and named custom themes within the document itself.