I'm working on some code that opens up model files and then uses the information inside to detect which materials which the model requires. As part of the development process, I have some automated tests where it re-opens a model and checks that it finds everything I expected it to find. So I'm asking for a model that uses all sorts of fancy and obscure features that create dependencies on external information (like materials). However, it could just be shaped as a cube because I don't plan to use it in-game. Now, I'm not a modeler, so I don't know the exact details, but basically selectable skins plus any weird or unusual features which have to do with involving new materials or other run-time dependencies. I figure if I can ensure my code handles a horrifyingly over-textured freak or modeling nature, it can probably handle most of the other things that get thrown at it.