Some feature from Flowbox have been completed today. Now I can browse around my files and folders.
However, it still need a lot of work and improvement, since in the current stage, it still working slowly and buggy.
As of now, I have able to change the widget size and image size using separated configuration files. To read configuration, I use ConfigFile class by kidscracker, which used on his E2 Light application. So for theme system, it is working now.