That's an idea - but it means changing code.
After getting to a position where I had so much custom work that I feared upgrading, I am now trying to work withing the CP as much as I can. To increase the size of the icon I need to change the template file. Then it gets forgotten in an upgrade as some of my others have.
I think I would prefer to put it into the description where I can also make it much more obvious to my customers.
I also have a button to go back to the previous page at the end of my detailed description.
Example:
http://www.malikstores.co.uk/product_details.php?category_id=57&item_id=1652
I have found that many of my customers don't understand - or can't recognise breadcrumbs.
My philosophy has become " make it VERY obvious "
Chris