Why not have a school leavers blog or alumni blog for children (and much older leavers) to tell their stories of their time at your school. I did this back in 2004 at Crumpsall Lane and we published stories going back to the 1940s on our website.
This form includes an image uploader and guidance on uploading images.
There is also a tick box to give consent for images uploaded to be used. This field could be deleted if intended for use in class only.
Download the attached file, then, on your blog, go to "Forms > Import/Export" and import the file.
Now publish a page entitled "Tell us your story" on a leavers' blog and click "Add Form" to add this form.