My gtkrc file theme for Pidgin.

gtkrc-2.0

style "purplerc_style"
{
    font_name = "Monospace 9"
    base[NORMAL]="#000000"
    text[NORMAL]="#FFFFFF"
    GtkIMHtml::hyperlink-color="#007FFF"
    GtkWidget::cursor-color="#60AFFE"
    GtkWidget::secondary-cursor-color="#A4D3EE"
}
style "my-blist" {
    font_name = "Monospace 9"
    text[NORMAL] = "#FFFFFF"
    text[SELECTED] = "#EEEEFF"
    bg[NORMAL] = "#000037"
    bg[SELECTED] = "#000000"
    base[NORMAL] = "#000037"
    base[SELECTED] = "#000000"
}
style "int_style"
{
    base[NORMAL]="#000000"
    text[NORMAL]="#EEEEFF"
    GtkIMHtml::hyperlink-color="#007FFF"
    GtkWidget::cursor-color="#60AFFE"
    GtkWidget::secondary-cursor-color="#A4D3EE"
    fg[NORMAL]               = "#FFFFFF"
    fg[ACTIVE]               = "#EEEEFF" 
    bg[NORMAL]               = "#141424"
    bg[PRELIGHT]             = "#000000"
    bg[ACTIVE]               = "#000031"
}
widget_class "*" style "int_style"
widget "*pidgin_conv_imhtml" style "purplerc_style"
widget "*pidgin_conv_entry" style "purplerc_style"
widget "*pidgin_blist_treeview" style "my-blist"