Last week at my 3T class I got share with the ladies all the great reasons to have some Flip Flaps in your stash.
Reason #1 - you can add a ton of photos to a page without it looking cluttered or too busy.
Reason #2 - they make great interactive elements to your scrapbooks.
And reason #3 - they are great for adding additional journaling. Or, if you have something private you can use it to keep you journaling hidden.
Flip Flaps also make great mini-albums.
Oh, here's a tip they are Flip Fl-A-ps - not flip flops...totally different thing.