Foswiki's default preferences are located in System.DefaultPreferences, however settings defined here have override priority and should be used for local customisations.
Set FAVICON = /pub/System/ProjectLogos/650x0f421v30_LLj_icon.ico
Customize your top bar background image and color
Set WEBHEADERART = /pub/System/PatternSkin/header5.gif
Set WEBHEADERBGCOLOR = #ffffff
Set USERSTYLEURL = /pub/System/PatternSkinCssCookbookSidebarToggle/SidebarToggle.css At some point : Set SKIN=sidetoggle,foswikiorg.nat, matter.nat, natedit, nat
Finalisation
FINALPREFERENCES locks site-level preferences that are not allowed to be overridden by WebPreferences or user preferences: