Just feed the hash into the thishumandoesnotexist Neural Network? Boom, human avatar.

That would be so creepy. Imagine a random face you've never seen in your life appearing as your avatar

Which resource do you think is the best for beginners into ML?

I used fastai book: https://github.com/fastai/fastbook

It also exists as hardcover

If you really wanted to take this next level, you could export some of the changes to a browser plugin called So-and-so elementary school Expperiment (you don't have to show them this) and say they can load the plugin on their home computers. Voila, their parents now have a tricked out NYT home page.