Try a web search of "school scrapbook ideas". For elementary kids I would go with fun stuff, buses, apples, primary colors. You can find free school clip art on the web, too.

Our elementary school just started a scrapbook
club. I am on the committee and was wondering
if any of you have some scrapbook page ideas?
Our elementary school is k-5 grades. Any ideas
would be greatly appreciated!
Thanks!