Here are a few ideas for ya!
Giant Pencils - as detailed at http://www.gluesticksandtape.com/2011/09/teacher-size-pencil.html (or try making colored pencils, crayons, markers, and glue sticks)
Turn these pencils into Box Top Collectors - as pictured at http://media-cache-ec4.pinimg.com/originals/54/4c/3f/544c3f894e9ae5860fb93e59e3c5c635.jpg
Pinhole Camera - as detailed at http://diycultures.pbworks.com/w/page/47794628/Pinhole%20Cameras%20(DIY%20approach%20to%20Photoraphy)
Bakers Twine Storage (or any type of string really) - as detailed at http://www.thescrapshoppeblog.com/2012/02/bakers-twine-storage.html
Charger Dock - as detailed at http://www.karimascrafts.com/2011/08/plug-organizer-tutorial.html
Give, Save, Spend Money Banks - as detailed at http://www.busykidshappymom.org/2011/08/give-save-spend-banks-make-your-own.html
Learning Tools such as Word Family Practice Tube - as detailed at http://boymamateachermama.com/2012/05/21/teacher-mama-word-family-practice-tube/
And the Place Value Practice Tube - as detailed at http://boymamateachermama.com/2012/06/28/teacher-mama-another-use-for-a-pringles-can-place-value/
Homemade Pick Up Sticks Game - as pictured at http://boymamateachermama.com/wp-content/uploads/2012/08/pickup-sticks-container.jpg and detailed at http://boymamateachermama.com/2012/05/09/boy-mama-from-chopsticks-to-pick-up-sticks/
You could try to use the circular container in place of the square one to create a periscope - as detailed at http://www.exploratorium.edu/science_explorer/periscope.html
Or a kaleidoscope - as detailed at http://momsnetwork.com/kids/crafts/crafts2.shtml or perhaps an easier version detailed at http://www.thechocolatemuffintree.com/2011/06/so-easy-kaleidoscope.html
If you don't want to get too crafty with them you could always use them as boot shapers - as mentioned at http://missiontosave.com/2012/09/third-thursday-repurpose-use-pringles-can-as-boot-shaper/
Also one may be able to use these containers as molds for soap and candle making.
I have wanted to try a few of these myself, but ran into a few bumps. For example: I can't figure out how to get the smell of the chips out of the empty cans for storage use, broke or cracked a lot of lids trying to cut holes into them, etc.
Hope this helped or at least inspired ya!