We all know that presentation is important, whether it is for a good meal or a good proposal. One way to show the range of what can be changed or modified is to get your participants to look at the pictures featured on this website.
I find these pictures remarkable.
http://thirdeyedumb.com/2007/04/the_power_of_makeup_different.html
How I Would Use This
I would show participants a handful of these pictures and ask them to match the girl with the job:
For example:
Secretary
Lawyer
Teacher
Cabaret Singer
Housewife and Mom
etc. You make up the categories.
I would not tell them that this is the same model in each picture.
Build to a discussion about how spin and marketing and presentation affect how we feel about things.