One of the things that might be a bit confusing at first (which I bet the sites never explain) is that there are two main kinds of theme: GTK themes and Window-manager themes (in your case, that's Xfce4). The window-manager themes control the look of the window decorations - that is the titlebar, the buttons, and the borders of the windows. The GTK themes control the look of GTK applications; that is, programs which were written with the GTK toolkit, which is popular. And some window manager themes pay attention to one's GTK theme, so it is still relevant. And some people make matching window-manager and GTK themes so that it will all be harmonious.
My Cedar-Brass GTK theme is here: http://gnome-look.org/content/show.php/?content=139506 It is a steampunk-ish look; dark wood with brass highlights. I made a matching Fvwm theme, but I haven't released it anywhere; the problem with Fvwm theming is that it isn't really standardized. No, that's just an excuse; I just don't feel like the extra effort needed to package up a theme and release it somewhere... (sigh)
Some additional GTK themes I've liked:
* Blueheart (black-and-blue) which is actually part of UbuntU: gtk2-engines-blueheart. * Greenheart (green-and-black) a variant of Blueheart. * Blue_Lagoon_X (grey with blue/green water look) * BrushedMetal (grey brushed-metal look, with teal) * CatBrass (olive green) * Cloudscape_Green (grey with cloudy green) * Country Oak (pale wood look) * Glossy Blue (blue, with blue glass) * Glossy Green (green, with green glass) * H2O Emerald (grey, with green glass) * H2O Saphire (grey, with blue glass) * Leaded Glass (grey, with clear glass) * TransMetal (another brushed-metal look, but brushed diagonally) * WoodenHead (another wood-style theme, medium brown)
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My Cedar-Brass GTK theme is here: http://gnome-look.org/content/show.php/?content=139506
It is a steampunk-ish look; dark wood with brass highlights.
I made a matching Fvwm theme, but I haven't released it anywhere; the problem with Fvwm theming is that it isn't really standardized. No, that's just an excuse; I just don't feel like the extra effort needed to package up a theme and release it somewhere... (sigh)
Some additional GTK themes I've liked:
* Blueheart (black-and-blue) which is actually part of UbuntU: gtk2-engines-blueheart.
* Greenheart (green-and-black) a variant of Blueheart.
* Blue_Lagoon_X (grey with blue/green water look)
* BrushedMetal (grey brushed-metal look, with teal)
* CatBrass (olive green)
* Cloudscape_Green (grey with cloudy green)
* Country Oak (pale wood look)
* Glossy Blue (blue, with blue glass)
* Glossy Green (green, with green glass)
* H2O Emerald (grey, with green glass)
* H2O Saphire (grey, with blue glass)
* Leaded Glass (grey, with clear glass)
* TransMetal (another brushed-metal look, but brushed diagonally)
* WoodenHead (another wood-style theme, medium brown)