Eric and I decided that instead of traditional favors we would rather do something fun.  So, we rented a photo booth and the guests were able to "play" in it the whole night.  They LOVED it!  The cool thing was that even our more elderly guests that we were worried about enjoyed it.  We used a company called Exposure Photography & Photo Booths.  They are a newer company so their prices are much more reasonable and they are still trying to prove themselves which means better service!  The owner was totally sociable at our meeting and made sure everything was personalized the way we wanted it.  
I strongly suggest not only a booth but the company too.
There info is:
Exposure
313-598-2171
website: myexposurephotography.com
email: 
myexposurephotography@hotmail.com                 
                
Re: GREAT favor idea!
Agreed.