/usr/share/themes/Xfce-kde2/gtk-2.0/gtkrc is in gtk2-engines-xfce 3.2.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 | style "default"
{
    GtkButton::default_border                    = {0, 0, 0, 0}     
    GtkButton::default_outside_border            = {0, 0, 0, 0}     
    GtkButton::default_spacing                   = 12               
    GtkButton::focus-line-width                  = 1
    GtkButton::focus-padding                     = 0
    GtkCheckButton::indicator_size               = 15               
    GtkRadioButton::indicator_size               = 15
    GtkMenuItem::selected_shadow_type            = in
    GtkPaned::handle_full_size                   = 1                
    GtkRange::slider_width                       = 15               
    GtkRange::stepper_size                       = 15               
    GtkRange::trough_border                      = 0
    GtkSpinButton::shadow_type                   = in
    GtkScrollbar::has_backward_stepper           = 1
    GtkScrollbar::has_forward_stepper            = 1
    GtkScrollbar::has_secondary_backward_stepper = 1
    GtkScrollbar::min_slider_length              = 20               
    GtkWidget::focus-padding                     = 2                
    GtkWidget::interior_focus                    = 2                
    xthickness = 2
    ythickness = 2
    bg[NORMAL] = { 0.863, 0.863, 0.863 }
    bg[SELECTED] = { 0.039, 0.373, 0.537 }
    bg[INSENSITIVE] = { 0.863, 0.863, 0.863 }
    bg[ACTIVE] = { 0.933, 0.933, 0.933 }
    bg[PRELIGHT] = { 0.933, 0.933, 0.933 }
    base[NORMAL] = { 1.000, 1.000, 1.000 }
    base[SELECTED] = { 0.039, 0.373, 0.537 }
    base[INSENSITIVE] = { 0.863, 0.863, 0.863 }
    base[ACTIVE] = { 0.863, 0.863, 0.863 }
    base[PRELIGHT] = { 0.933, 0.933, 0.933 }
    text[NORMAL] = { 0.000, 0.000, 0.000 }
    text[SELECTED] = { 1.000, 1.000, 1.000 }
    text[INSENSITIVE] = { 0.718, 0.718, 0.718 }
    text[ACTIVE] = { 0.000, 0.000, 0.000 }
    text[PRELIGHT] = { 0.000, 0.000, 0.000 }
    fg[NORMAL] = { 0.000, 0.000, 0.000 }
    fg[SELECTED] = { 1.000, 1.000, 1.000 }
    fg[INSENSITIVE] = { 0.718, 0.718, 0.718 }
    fg[ACTIVE] = { 0.250, 0.250, 0.250 }
    fg[PRELIGHT] = { 0.000, 0.000, 0.000 }
    engine "xfce" 
    {
        smooth_edge = true
        boxfill
        {
            fill_style = plain
        }
    }
}
widget_class "*" style "default"
style "menustyle" = "default"
{
    xthickness = 3
    ythickness = 3
    engine "xfce" 
    {
        smooth_edge = true
        boxfill
        {
            fill_style = plain
        }
    }
}
widget_class "*BonoboDockItem"     style "menustyle"
class "*BonoboDockItem"            style "menustyle"
widget_class "*HandleBox"          style "menustyle"
class "*HandleBox"                 style "menustyle"
widget_class "*ToolBar"            style "menustyle"
class "*ToolBar"                   style "menustyle"
widget_class "*MenuBar"            style "menustyle"
class "*MenuBar"                   style "menustyle"
style "buttonstyle" = "default"
{
    xthickness = 3
    ythickness = 3
    engine "xfce" 
    {
        smooth_edge = true
        boxfill
        {
            fill_style = gradient
            orientation = vertical
            shade_start = 1.10
            shade_end = 0.90
        }
    }
}
widget_class "*Button*"            style "buttonstyle"
class "*Button*"                   style "buttonstyle"
# This is for ROX-Filer
# 
style "rox" = "default"
{
  bg[NORMAL] = "#ffffff"
  bg[ACTIVE] = "#ffffff"
}
widget_class "*Collection"         style "rox"
# This is for the window borders (xfwm4 & metacity)
# 
style "titlebar"
{
    bg[SELECTED]      = { 0.039, 0.373, 0.537 }
    fg[SELECTED]      = { 1.000, 1.000, 1.000 }
    bg[INSENSITIVE]   = { 0.933, 0.933, 0.933 }
    fg[INSENSITIVE]   = { 0.250, 0.250, 0.250 }
}
widget "xfwm"             style "titlebar"
class "MetaFrames"        style "titlebar"
widget_class "MetaFrames" style "titlebar"
 |