Vecna [1], today published ampislay [2], an 8 years old project to implement anonymous communication trough IP spoofing.
It's a not-so-conventional techniques, that have it's advantage and weakness, but that maybe considered within the Tor community for some particular use-case.
It was a gift for my 2004 birthday (thanks!!!) :-)
-naif
[1] http://www.delirandom.net [2] https://github.com/vecna/apmislay