DEFAULT

The DEFAULT Theme may appear with different color values depending on media type and other highly secret iTunes algorithms.

Basically, this should be called the "I Feel Lucky" Theme because you never know what you're going to get.
(LANGUAGE TBD)

Selected Podcasts have various Themes

Choose a new theme above or leave it at

"...Mixed Values - NO CHANGE"

to not affect the Themes of your selected Podcasts.