Maybe we should rename some of these Fixtures methods, as they are now called from the test clases like this: 
self.create(), which, IMHO can be a bit confusing (previously it was Fixtures.create() which is self explanatory).
Also consider if the effort worths it, because anyway we should create a better and more flexible fixtures separated from this class I believe, either with Factory_boy as has been proposed or in any other way.