I’ve been working this week with the new version of SpTBX library. It’s a set of controls that I use in CE (menu,toolbars,buttons etc.). Thanks to Robert Lee’s great work, the new version now supports skinning. I had to do quite a lot modifications to CE to make the new version work correctly but it’s mostly up and running now.
There’s few cool new themes available but some old themes are missing, like Aluminum. 
I wrote a simple skin editor that makes it easier to create your own skins.
SpSkin Editor, source + exe (852KB)
http://cubicreality.pp.fi/files/misc/SpSkinEditor.zip
I’m still not sure when the next release date is. I’ve done some work on the options dialog and have pretty good idea on how it will look and feel.
nice to see that things started moving again
Hmmm.. This looks very interesting
How do I make CE use the skins I create?
You have to wait for the next release. There’s no custom skin support in previous versions. I’ll release “snapshot” version this week.
Other skin editor for SpTBX (free):
http://www.mytreedb.com/view_downloads/m-soft/i-75.html