In the last two days I programmed a little spirograph made in C++, SFML.
For now I can't show you my code, because it's looking awful, but I made a little video of the spirograph in action. Please forgive me for the bad quality, it's my very first video and I just made it in 5 minutes.
If somebody wants to see the code just tell me and I'll put it on github after refactoring.