change students bus, no school bags and fun classe

dear,
I don't know how to change the change students bus, no school bags and fun classes items in the middle of the template. Is it a module? I cannot find it. And can I choose different pictures instead of the bus and bag?
Thanks!

That are just articles. Images are part of content

You can change these images when you edit the articles. Just look for tab "Images and links".

Thanks