I am playing with lxappearance, gtk-chtheme, and gtk2-theme-switch to look at various themes on two systems. I can see some differences as I view different choices. But how can I recognize if a theme engine (like murrine, pixbuf, unico) is in use versus a static theme? I know I can look in the gtkrc file and see if the engine is defined, but I am wondering if there is something I can visually notice when viewing my desktop to recognize it. Any thoughts on this?