"/* Here you can re-define any of variables from variables.less, colors.less and fontawesome.less */"
I changed (#fff) to (#fff000) in 3 (_variables.less) places as a test, and cleared out the cache, but I don't see the (fff000) color changes. The re-define sentence is very easy for me to catch on to, but I appear to be missing something.
// Layout elements
@color-layout-border: @color-black-shade-border;
@color-layout-header: @color-font;
@color-layout-sidebar-background: #FFF000;
@color-layout-list-background: #FFF000;
@color-layout-content-background: #FFF000;
@color-layout-header-background: #f4f4f4;
@color-layout-footer-background: #fff;