This plugin allows the implementation of custom super entities into other plugins. It gives developers the ability to construct entities out of other entities for use in their plugins.
This plugin comes with built-in 'Test' entities for showcase and code testing purposes. In the config file there is only a single parameter whether or not to allow the spawning of these test entities.
These are the commands to spawn the various test entities if it is allowed. To use these commands you must be an OP:
All of the test mobs only contain one active mob, so none of the other mobs they are constructed of will actually do anything. The Dalek is the only really dangerous one (it can one-shot you) as it was actually designed to be used in a plugin whereas the creeper, per say, was just for fun (however it does contain a single real creeper to control its movement)
None, you just need to be an OP and have the parameter in the config file set to true to spawn any of the test mobs if you wish.
Massive Creeper:

Minecart Tower:

Dalek Prototype:

Blaze Tower:

http://forums.bukkit.org/threads/api-meta-mobs.264676/
https://bitbucket.org/Jogy34/meta-mobs/src
If anyone has any ideas please feel free to share them.
If anyone finds any please alert me about them.