An antonym for "theme" could be "variation" or "divergence."
Appreciation
Cursed. 
hideous, ugly, unsightly
an antonoym for degree is not having one at all or not even going to school for one.
what is the theme of Autumntime
Office Theme
country western theme, pop star theme, vampire theme, harry potter theme, camping theme, beach/Hawaiian theme, decade themes (ie. 50s, 60s, 70s, 80s theme, etc), sports theme...
Cell Styles Gallery
You could do a beach theme, or an underwater theme.
what is theme
Randy Orton- Voices Vladamir Kozlov Theme Maryse theme Cris Jericho New Theme (Save Me) Santino Marella Theme Ted D and Cody R- Priceless WWE Smackdown New Theme Kelly Theme (2009) Fu Naki theme Natalya Theme Even Bourne Theme William Regal Theme (King) The Boogey Man Theme John Cena Theme (Moving Up)
a theme is like a topic and subject of a theme is more specific about the topic.