Simple and Powerful Theme Management Attribute:

• Set a theme for a page or a page tree (including sub-pages)
• Very easy and intuitive integration (uses Page Attribute)
• Specify a starting date (or not)
• Specify an ending date (or not)
• Theme preview
• Theme selection using their thumbnails

If you feel the need of a specific filter or any feature, feel free to PM me! I'll see what I can do