I only just found out that Girl Guides has a flickr site. Of particular interest was the album of Girl Guide Cookie Box History. It contains photos of cookie boxes from 1960 to 2010.
This is a great way to introduce a little Guiding History into your Cookies Rising program. Why not show these images to the girls and ask them to draw what they think the box might look like in 5, 10 or even 25 years in the future.