craft ideas paper towel rolls

Help! Need Creative CRAFT ideas for kids!?
I teach sunday school, and being thrifty as I am, I wanted to have a “recycle craft day” so I’ve been saving items like toilet tissue rolls, paper towel rolls, water bottles, metal cans of variable sizes, and even egg cartons. Any ideas out there (that are simple) and don’t require a lot of detail. We usually have about 1/2 hr to do a craft. Thanks for reading and help me get those young creative minds at work and save money on materials.(not to mention less trash in our landfills) WEBSITES would be helpful too!
crafts using paper towel rolls: http://www.thriftyfun.com/tf518068.tip.html
crafts using toilet paper rolls: http://www.dltk-kids.com/type/tp_roll.htm
crafts using water bottles:http://milestones.geoparent.com/2008/05/05/empty-water-bottle-crafts-for-kids/ *OR* http://www.artistshelpingchildren.org/artscraftsideasplasticbottlesprojectskids.html (you have to scroll down a little bit and it has ideas by the letter)
crafts using egg cartons: http://www.talkingchild.com/craftsegg.aspx
hope this helps! =)
Art Projects for Kids : How to Make Paper Towel Roll Binoculars
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