The skin currently used for the xfce4-notes windows, irrespective of the colour chosen, can make the app look so much different from the rest of the GTK desktop apps. Would it make sense to add an option to use the generic GTK theme for the windows, without colour or custom theming?
git aec9c7a8 there is a new background color "GTK+" that will pick up the background from the current gtk+ theme
PS: to answer the question "[...]without [...] custom theming" -> no
I see: the wm decorations, tabs and scrollbars cannot be stock xfwm4 and GTK, respectively. Thanks for looking into this