What to do with shipping envelopes

[willow-starr.livejournal.com]

I'm volunteering at my campus radio station over the summer and we have hundreds of shipping envelopes (manilla envelopes lined with bubble wrap) from people sending us CDs. They can't be recycled here and we don't want to throw them out and I figured if anyone had crazy crafty ideas of what to do with them - you folks would. Any suggestions?

Also - if you live the Peterborough ON area and want some please just let me know!