I'd like to propose a file that allows you to change your skin color. We do it when we tan; why can't we make a permanent all-over change?
There are a few medications that allow one to darken skin on a temporary basis. I don't see why hypnosis couldn't make such a change permanent. Drugs were used by a white man to temporarily change his skin color; this was the basis of the non-fiction book Black Like Me (copyright 1951) by Robert Charles Grifffin. [Further info: http://en.wikipedia.org/wiki/Black_Like_Me]
I don't think I have ever seen this suggested. I'm not sure it's possible to change one's skin color on a permanent basis (though there are drugs that can darken skin that has been robbed of melanin by vitiligo -- but ... I'd love to be the beta tester (hell, even alpha tester) for a file of this sort.