I just added support for RAD Studio XE8 to the Delphi IDE Theme Editor (1.8.1.0). 
Also a new feature was introduced to allow edit the values (color and font) of the modern theme (only available in XE8). To use it just press the button “Additional Settings” and set values for the Main ToolBar and the IDE Font, finally press the button “Apply”. Also you can restore the default settings pressing the button “Restore”.
Screenshots
You can download the DITE from here
The Road to Delphi 
April 9, 2015 at 3:27 am
nice update thanks.
a little correction though, the download link in your post redirects to “Delphi ide colorizer” instead of “Delphi ide theme editor”.
April 9, 2015 at 10:03 am
Thanks, the link was updated.
April 9, 2015 at 9:56 am
Rodrigo@
I can create my script by using RAD Studio Delphi XE7 ?
and something work? unpack my games ?
August 4, 2015 at 4:17 pm
How can I restore original style for ide? I changed xe8 ide style and decide to revert back to its original style.
August 5, 2015 at 9:54 am
Use the option Set default theme values for selected IDE in the popupmenu of the available themes.