If interested in an other project that offers good tweaking, artbreeder (artbreeder.com) has been around for a while too. You have different models to play with (faces, anime, general, buildings, paintings etc...). Not all of them have the same level of quality and customization, but for example if you go for the face one, you get a really high level of customization: "cross-breeding" of 1 to 8 faces and then tweaking of many attributes (gender, color theme, age, ethnicity, realism, and other various details).