CKEditor default skins are fugly, up until now I've been using the Office2003 skin due to lack of available skins for ckeditor that don't look like puke, I've started on my own. Not all parts are themed, just the functions I use. Icons are Famfamfam silk and base skin is Office2003 from ckeditor. I've tried to keep it simple, colourless and plain. I plan to update the skin as i discover bugs and or require new features. Please send comments or contact me if you have any suggestions, etc.
Edit Oct 05 2011: Now officially named "Slick". I will be working towards minor bugfix release in asap and a major release for the CKEditor add-ons forum.
Edit Dec 01 2011: Thanks for all the feedback. I am busy with work but still promise to make a new release soon. The new release will also have a different license pending response from Silk icon creator. GPL would be nice. And a GIT repository for updates. Cheers, thanks for being patient. Chris.