The only ones that I've found are Windows "mods" that use a combination of NTLite[1] for feature removal and slipstreaming and some edits to icon resources in system32.dll etc.
Did you have something else in mind? Email is in my profile in case you have a link that you can share.
If you're willing to ignore Imaginary Property laws, there are some very interesting chimeric OSes out there on the shadier parts of the Internet.