TINKERCAD
Tinkercad is 3d modeling interface that you can make so many 3d objects on it. There is so my possibilities of inventing things and be creative. You could make a plane or a tiger, and you can make anything you could imagine. Once your done with your 3d model you could print it on a 3d printer (well you have access to one.) Otherwise you could save the object, and start making new ones. Tinkercad has so many things to do and its great for a place to start on 3d modeling.