I found where accepted answer image comes from, but coundn't find the same information about other images.
1 Answer
Some information can be found in original questions about design
- What should our logo and design look like once we are no longer in beta?
- Design for Science Fiction & Fantasy
Particulary,
Badges are resembling the shape of Star Wars Rebel Alliance insignia.
Header image is the rune circle around the female warrior's silhouette.