Here is a thread from a mom that has really cute Disney bags that she did that includes pictures of the bags and what she had inside.
http://www.disboards.com/showthread.php?t=2005108&page=2
She said she got her bags at the
disney store for around $8-12
You could make journals from Natalie:
http://www.4shared.com/dir/5978989/a06aa930/Natalies_DISigns.html
You could make autograph books from any one of several great DISigners including Natalie and:
http://s345.photobucket.com/albums/p379/ljcollins_2008/
http://s226.photobucket.com/albums/dd181/Chaos1Cent/?start=0 (Penny)
Walmart has small photo books (the kind you slip 4x6 photos in) with Disney Characters on them and you could print generic cards for the different locations (Magic Kingdom, Hollywood, etc.) to go in them. Penny has some great blank ones for each park.
I found Mickey playing cards at my Walmart for Snap and Go Fish.
You could also make a number of candy wrappers from Telynn:
http://www.4shared.com/dir/6658211/c9588e82/sharing.html
she has wrappers for candy bars, gum, life savers, etc.
There are so many wonderful things on this site that you can make to put in the bags!!!
Hope this helps!