I just came across ZooBurst. A free and paid for service that lets you make virtual pop up storybooks and they even have an augmented reality browser for it as well.
There are teacher and student sign ons so you can set up your whole class to make their own pop up book.
This is a great language activity as well as for languages other than English.
The free version lets you put together 10 pages on unlimited books and will let you upload your own art work or you can use the open clip art they have linked to.
Check out my book below - took about 3 mins