An example of what i mean
here is the actual gtkrc file included in the setup
******************************************
# Remove the # to run a certain theme.
gtk-theme-name = "Aurora-Midnight"
#gtk-theme-name = "Clearlooks Human Dark"
#gtk-theme-name = "AnachronAna"
#gtk-theme-name = "Aurora"
#gtk-theme-name = "Aurora Steel"
#gtk-theme-name = "Aurora-looks"
#gtk-theme-name = "Chocolate"
#gtk-theme-name = "Chocolate-Murrine"
#gtk-theme-name = "Clearlooks Human"
#gtk-theme-name = "Foresight"
#gtk-theme-name = "OSX-theme"
#gtk-theme-name = "tish"
#gtk-theme-name = "tish-aquastyle"
#gtk-theme-name = "VistaBut"
#gtk-theme-name = "Vista-Gray"
#gtk-theme-name = "Amaranth"
#gtk-theme-name = "Bluecurve"
#gtk-theme-name = "Bluecurve-BerriesAndCream"
#gtk-theme-name = "Bluecurve-Gnome"
#gtk-theme-name = "Bluecurve-Grape"
#gtk-theme-name = "Bluecurve-Lime"
#gtk-theme-name = "Bluecurve-Slate"
#gtk-theme-name = "Bluecurve-Strawberry"
#gtk-theme-name = "Bluecurve-Tangerine"
#gtk-theme-name = "Blueprint"
#gtk-theme-name = "Blueprint-Green"
#gtk-theme-name = "Blueprint-Ice"
#gtk-theme-name = "Blueprint-no-color"
#gtk-theme-name = "Blueprint-Sand"
#gtk-theme-name = "Candido-Calm"
#gtk-theme-name = "Candido-Candy"
#gtk-theme-name = "Candido-DarkOrange"
#gtk-theme-name = "Candido-Hybrid"
#gtk-theme-name = "Candido-NeoGraphite"
#gtk-theme-name = "CleanIce"
#gtk-theme-name = "CleanIce-Dark"
#gtk-theme-name = "Clearlooks"
#gtk-theme-name = "ClearlooksClassic"
#gtk-theme-name = "ClearlooksTest"
#gtk-theme-name = "Crux"
#gtk-theme-name = "Darklooks"
#gtk-theme-name = "Default"
#gtk-theme-name = "Delightfully-Smooth"
#gtk-theme-name = "DyndynBlueGray"
#gtk-theme-name = "DyndynPinkGray"
#gtk-theme-name = "Emacs"
#gtk-theme-name = "G26"
#gtk-theme-name = "Glider"
#gtk-theme-name = "Glossy"
#gtk-theme-name = "HighContrast"
#gtk-theme-name = "Gorilla"
#gtk-theme-name = "HighContrastInverse"
#gtk-theme-name = "HighContrastLargePrint"
#gtk-theme-name = "Human"
#gtk-theme-name = "Industrial"
#gtk-theme-name = "Inverted"
#gtk-theme-name = "LargePrint"
#gtk-theme-name = "LighthouseBlue"
#gtk-theme-name = "LowContrast"
#gtk-theme-name = "LowContrastLargePrint"
#gtk-theme-name = "Lush"
#gtk-theme-name = "Metal"
#gtk-theme-name = "Mist"
#gtk-theme-name = "MS-Windows"
#gtk-theme-name = "MurrinaAquaIsh"
#gtk-theme-name = "MurrinaAzul"
#gtk-theme-name = "MurrinaBleu"
#gtk-theme-name = "MurrinaBlue"
#gtk-theme-name = "MurrinaCandido"
#gtk-theme-name = "MurrinaCandy"
#gtk-theme-name = "MurrinaCappuccino"
#gtk-theme-name = "MurrinaChrome"
#gtk-theme-name = "MurrinaCream"
#gtk-theme-name = "MurrinaEalm"
#gtk-theme-name = "MurrinaFancyCandy"
#gtk-theme-name = "MurrinaGilouche"
#gtk-theme-name = "MurrinaLoveGray"
#gtk-theme-name = "MurrinaNeoGraphite"
#gtk-theme-name = "MurrinaVerdeOlivo"
#gtk-theme-name = "Nimbus"
#gtk-theme-name = "Nimbus-Dark"
#gtk-theme-name = "Nodoka"
#gtk-theme-name = "Nodoka-Aqua"
#gtk-theme-name = "Nodoka-Gilouche"
#gtk-theme-name = "Nodoka-Looks"
#gtk-theme-name = "Nodoka-Midnight"
#gtk-theme-name = "Nodoka-Rounded"
#gtk-theme-name = "Nodoka-Silver"
#gtk-theme-name = "Nodoka-Squared"
#gtk-theme-name = "Nuvola"
#gtk-theme-name = "Redmond"
#gtk-theme-name = "Rezlooks-candy"
#gtk-theme-name = "Rezlooks-dark"
#gtk-theme-name = "Rezlooks-Gilouche"
#gtk-theme-name = "Rezlooks-graphite"
#gtk-theme-name = "Rezlooks-Snow"
#gtk-theme-name = "Simple"
#gtk-theme-name = "Rezlooks-Snow"
#gtk-theme-name = "Smooth-Funky-Monkey"
#gtk-theme-name = "Smooth-Line"
#gtk-theme-name = "Smooth-Okayish"
#gtk-theme-name = "Smooth-Sea-Ice"
#gtk-theme-name = "Smooth-Tangerine-Dream"
#gtk-theme-name = "Smooth-Winter"
#gtk-theme-name = "ThinIce"
#gtk-theme-name = "tish"
#gtk-theme-name = "tish-aquastyle"
#gtk-theme-name = "Unity"
#gtk-theme-name = "VistaBut"
#gtk-theme-name = "Wasp"
#gtk-theme-name = "Xcl-aqua"
#gtk-theme-name = "Xcl-aqua-dark"
#gtk-theme-name = "Xcl-bubblegum"
#gtk-theme-name = "Xcl-bubblegum-dark"
#gtk-theme-name = "Xcl-clarius"
#gtk-theme-name = "Xcl-clarius-dark"
#gtk-theme-name = "Xcl-flat"
#gtk-theme-name = "Xcl-flat-dark"
#gtk-theme-name = "Xcl-inverted"
#gtk-theme-name = "Xfce"
#gtk-theme-name = "Xfce-4.0"
#gtk-theme-name = "Xfce-4.2"
#gtk-theme-name = "Xfce-4.4
#style "user-font"
#{
font_name="comic sans ms 10"
#}
# widget_class "*" style "user-font"
because - gtk-theme-name = "Aurora-Midnight" has no # mark in front then that theme will be default.
If you re-place the # mark in front of it like this
# gtk-theme-name = "Aurora-Midnight"
and remove one from another line THAT theme will be default.
I hope that clears things up a bit more.
