You could replicate a style folder in your own ~/.fluxbox/styles/ folder
to use one of these styles.

Well, there's only one right now. The "nothing" style. It is designed
to mimic TinyWM's "nothing" interface. My fluxbox came pre-configured
to behave like TinyWM (mod1+leftClick to move, mod1+rightClickDrag to
resize) so this works very well. Of course, you can turn your toolbar
on or off or autohide it for a closer look.