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You can change the CKEditor skin by adjusting a single configuration option. In eXo Platform, to change the CKEditor skin, do as follows:
1. Open the /webapps/eXoStaticResources/eXoConfig.js configuration file of CKEditor.
2. Set up a skin for CKEditor. It may be the name of the skin folder inside the editor installation path, or the name and the path separated by a comma.
config.skin = 'v2';
config.skin = 'myskin,/customstuff/myskin/';
By default, CKEditor has 3 skins for users to select: v2, kama, and office2003. They are placed in the /webapps/eXoStaticResources/ckeditor/skins folder.