in this video you can see a way to connect a Lego axis to a motor shaft hub. This way you can have fun combining Lego and Makeblock products like the mBot Ranger.
Here is the link: https://youtu.be/gRa2ryze1F4
I added a kind of propeller to the mBot Ranger:
And I used an idea from the Airblock video of Makeblock to make a laughing face.