Here is an idea for an alternative to using regular file folders for your lapbooks.
Here are some lapbooks that a family made. I especially like their "winter vacation lapbook". This would be a great idea for a summer vacation, too. She doesn't give any links for printables, but definately has some good examples.
Jimmie has some great examples of lapbooks, also.
Another site with some great ideas and links to printables.
This is an adorable "ladybug" lapbook with a how-to on Youtube. Make sure to scroll down and check out the other ones also.
Here are some links on how to make those little lapbook mini booklets and a LOT of other links to lapbook related things.
LapbookLessons is a must!
Homeschool Launch has a mixture of everything, not just for lapbooks. This is a site to network and share your resources.