I loved the silver skin of old FCKeditor. So I simply copied v2 skin of CKEditor, replace _v2 with _silver and some colors in CSS files.
Licensed under the terms of the GPL.
1. Extract the archiv and copy the "silver" folder to CKEditors "skins" folder.
2. In the CKEditor configuration file (config.js) add the following code:
config.skin = 'silver';