I use fluxbox but never use any of the add-on tools because none of them really seem to do all that much. Instead, I just edit all files by hand, which is what I prefer anyway.
For those fancy styles, find one you like online and uncompress it, or edit one of the default styles to your liking, then drop it into your ~/.fluxbox/styles directory (note that you'll probably need to create the "styles" directory), then choose "user styles" from the fluxbox right-click menu.
The fluxbox faq is a good one and answers most of what you'll want to know:
http://fluxbox.sourceforge.net/docs/en/faq.php