I made some with a highschool girls years ago to help her get her community volunteer time for school credit.
I found these links:
http://sewing.about.com/od/healthbea.../walkerbag.htm
http://www.bevscountrycottage.com/seniors.html
http://www.sewingsupport.com/sewing-...lker-bags.html
actually here is the search engine link more than I thought.
http://www.bing.com/search?q=free+wa...ox&Form=IE8SRC
Just make sure the fabric you use can withstand heavy hot water washings.
Happy hunting,
Dawn