On my Debian system that style is called 'Debian-Dark'.
Here is a copy of the config file:
Code:
## This is based off the work by Dennis Brand ( narcan ) on this package.
## Thanks, Dennis!
style.name: Debian Dark
style.author: Paul Tagliamonte <paultag@ubutu.com>
# background ------------------------------------
background: centered
background.pixmap: /usr/share/fluxbox/debian-dark.png
# fonts------------------------------------------
menu.frame.font: sans-9:bold
menu.title.font: sans-10:bold
toolbar.clock.font: sans-9:bold
toolbar.workspace.font: tahoma-10:bold
toolbar.iconbar.focused.font: sans-8:bold
toolbar.iconbar.unfocused.font: sans-8
window.font: sans-8
#menu --------------------------
menu.roundCorners: topleft topright bottomleft bottomright
menu.bevelWidth: 1
menu.itemHeight: 15
menu.titleHeight: 15
menu.borderColor: #224550
menu.borderWidth: 1
menu.bullet: triangle
menu.bullet.position: Right
menu.title: flat gradient rectangle
menu.title.justify: center
menu.title.color: #000000
menu.title.colorTo: #b10643
menu.title.textColor: #bfbfbf
menu.frame: flat gradient
menu.frame.justify: left
menu.frame.color: #191616
menu.frame.colorTo: #000000
menu.frame.textColor: #bfbfbf
menu.frame.disableColor: #cfa7a7
menu.hilite: flat gradient
menu.hilite.color: #830934
menu.hilite.colorTo: #000000
menu.hilite.textColor: #bfbfbf
# toolbar -----------------------
toolbar.bevelWidth: 1
toolbar.borderWidth: 1
toolbar.borderColor: #224550
toolbar.height: 20
toolbar.justify: center
toolbar: flat
toolbar.pixmap:
toolbar.color: #191616
toolbar.colorTo: #000000
toolbar.clock: flat gradient rectangle
toolbar.clock.justify: center
toolbar.clock.color: #000000
toolbar.clock.colorTo: #b10643
toolbar.clock.textColor: #bfbfbf
toolbar.workspace: flat
toolbar.workspace.justify: Center
toolbar.workspace.color: #000000
toolbar.workspace.colorTo: #b10643
toolbar.workspace.textColor: #bfbfbf
toolbar.button: flat
toolbar.button.color: #000000
toolbar.button.colorTo: #000000
toolbar.button.picColor: #830934
toolbar.button.pressed: flat
toolbar.button.pressed.color: #bfbfbf
toolbar.button.pressed.colorTo: #bfbfbf
toolbar.button.pressed.picColor: #830934
toolbar.iconbar.empty: flat
toolbar.iconbar.empty.color: #000000
toolbar.iconbar.empty.colorTo: #000000
toolbar.iconbar.focused: flat gradient
toolbar.iconbar.focused.color: #830934
toolbar.iconbar.focused.colorTo: #000000
toolbar.iconbar.focused.textColor: #ffffff
toolbar.iconbar.focused.justify: center
toolbar.iconbar.unfocused: flat
toolbar.iconbar.unfocused.color: #000000
toolbar.iconbar.unfocused.colorTo: #000000
toolbar.iconbar.unfocused.textColor: #6f6f6f
toolbar.iconbar.unfocused.justify: center
# window ------------------------------
window.roundCorners: bottomleft bottomright
window.bevelWidth: 1
window.shade: true
window.borderWidth: 1
window.borderColor: #224550
window.justify: Center
window.title.height: 20
window.title.focus: flat gradient rectangle
window.title.focus.color: #000000
window.title.focus.colorTo: #b10643
window.title.unfocus: flat
window.title.unfocus.color: #212121
window.title.unfocus.colorTo: #212121
window.label.focus: flat gradient rectangle
window.label.focus.color: #000000
window.label.focus.colorTo: #b10643
window.label.focus.textColor: #bfbfbf
window.label.unfocus: flat gradient
window.label.unfocus.color: #191616
window.label.unfocus.colorTo: #000000
window.label.unfocus.textColor: #bfbfbf
window.button.focus: flat
window.button.focus.color: #4C4C4C
window.button.focus.colorTo: #4C4C4C
window.button.focus.picColor: #C5C5C5
window.button.unfocus: flat
window.button.unfocus.Color: #4C4C4C
window.button.unfocus.ColorTo: #4C4C4C
window.button.unfocus.picColor: #797979
window.button.pressed: flat
window.button.pressed.color: #4C4C4C
window.button.pressed.colorTo: #4C4C4C
window.button.pressed.picColor: #C5C5C5
window.handle.focus: flat
window.handle.focus.color: #212121
window.handle.focus.colorTo: #212121
window.handle.unfocus: flat
window.handle.unfocus.color: #212121
window.handle.unfocus.colorTo: #212121
window.handleWidth: 3
window.grip.focus: flat
window.grip.focus.color: #3F5F42
window.grip.focus.colorTo: #3F5F42
window.grip.unfocus: flat
window.grip.unfocus.color: #212121
window.grip.unfocus.colorTo: #212121
Which is normally found in
/usr/share/fluxbox/syles.
Hope that helps.