Really nothing major. I'm using the blue style, but if I go to the archive (https://vborg.vbsupport.ru/archive/) it starts using the archive style (purple) even after I get out of the archive. The only way to revert it is to close the window or resubmit the style in the usercp.
That's to save on server resources i believe. Having it in blue would mean loading of several images when its meant to serve a purpose to give guests using search engines a sneak preview of the site