Hi all,
after some silence about ths thread:
I provided a new version of the GS 6.x cover, reflecting the comments during the voting.
Find there the pngs and the odg:
https://wiki.documentfoundation.org/User:K-j/Drafts/Design/Front-Guide#Version_2
https://wiki.documentfoundation.org/Documentation/Covers_60#Suggested_Covers_for_6.0_book_edition
If you think it will be our cover for 6.x we can start to make the covers for the other modules.