Atmel Gallery is a great place to get extensions for the Atmel Studio IDE and they are constantly adding new extensions but there are still some extensions that I personally would like to use but have not made available by Atmel yet. Therefore I am offering the Color Theme Editor
here and in the future I may add more. If you would like me to add an extension please leave a message in the forum and if possible I will make it available.
To install download the file, navigate to the download folder and double click on the .vsix file. You will have to restart Atmel Studio for it to be available.