To begin, download one of my Mods as an exemple :
UI/HUD Gold
UI/HUD Green
In those Mods the file "Resource\Themes\Civ4\Civ4Theme_HUD.thm" has been modified (lines 882 to 892). You won't have to do that.
If you have any problem with the advisor's icons at top-right of main interface, open this file in any text editor, search for "../Beyond the Sword/Resource/Civ4/HUD/HUD_BTS_icons.tga" and replace it with "Resource/Civ4/HUD/HUD_BTS_icons.tga".
Unzip the folder in [Your Civilization IV folder]\Beyond the Sword\Mods"
If you rename the unzipped folder or if you use it in an other Mod :
Open the file "Resource\Civ4.thm" (with any text editor), and change the text to :
Code:
// *** Control Bitmap Theme file
// Set the resource
resource_path "Mods/[THE NAME OF YOUR MOD]/Resource";
// Setup common properties
include "Mods/[THE NAME OF YOUR MOD]/Resource/Themes/Civ4/Civ4Theme.thm";
Open the file "Assets\XML\Art\CIV4ArtDefines_Misc.xml" and search for "DEFAULT_THEME_NAME". In the next line, change the "path" to :
Code:
<Path>Mods/[THE NAME OF YOUR MOD]/Resource/Civ4.thm</Path>