The LEGO Mindstorms EV3 31313 set comes with 17 models you can build, program and play with. Yes, I know that the official models are just 5, but there are also 12 bonus models developed by the LEGO MINDSTORMS Experts Panel. I am one of 12 people in the Panel, and the bonus model I made for you is the EL3CTRIC GUITAR, a LEGO guitar that you can play like a real one! So you can make music with LEGO!
You can find all the bonus models in the third tab of the EV3 Software Lobby named “More Robots”. Click on the image of the model, and you will see the building instructions and the program to make it work. You can also download the building instructions from LEGO MINDSTORMS official website.