“Blóðberg” is the long-awaited single after 10 years, marking the return of Kjartan Sveinsson.

According to Jónsi:

“In Icelandic, it’s Blóðberg. It means "creeping thyme.” It’s these little herbs, they grow in the highlands in Iceland and they’re pretty pink and very fragrant. So it’s nice to see that opposite of the bleak, colorless Icelandic nature with this extremely pink, vibrant herbs.“

The cover of this single is directly tied to the album cover, as what remained of the rainbow is completely charred; as the burning of Rainbow I-IV is complete. Which could mean the closure of Earth to Heaven, or up to many other interpretations.

(Thank you @Anak)!