Namaste' SevaShakti-ji,
Unfortunately, when it comes to our cultural icons being commercialized, we are at a loss. It may be unfortunate, or it may be not - but the reality is, it always appears to me that the Judeo-Christian community in this country are a lot more casual about their religious icons being commercialized than we do.
Think of this, SevaShakti-ji! I remember the toilet seat case too the "Sitting Pretty" scenario, when they put the image or Lord Ganesha and others in a toilet seat cover. The company was also putting the image of Virgin Mary, if I remember correctly! And unless I totally missed it, I don't remember hearing a big hub-bub from the Catholic community on that subject.
Crosses and Stars of David could be used and placed anywhere, just as long as there is no protests. It is really hard for the Judeo-Christian community to even grasp that Hindus may take offense to their cultural and religious images being used haphazardly with no regard to the respect due to these images! They simply don't understand because I would guess they don't have something parallel to it in their own religious teaching.
However, it may still help to ask them to think of their icons, such as Lord Jesus or the Virgin Mary being placed on those items - would they be totally "O.K" with it?
The problem is, if it is a lunch box, a bag, a purse, an article of clothings, etc, chances are they would say they are "totally OK" with it! Maybe if it is more like a toilet seat cover, you may get mixed reaction. The person who produced "Sitting Pretty" toilet seat covers seems to have had no trouble in putting the image of Virgin Mary! But others may take offense to that.
Another thing you could say is probably "the image is sacred to us, Hindu. It is to be treated only with the utmost respect."
They may still don't understand it, but at least they would get the "gut feelings" level of Hindus' feeling that they had been disrespected, though unknowingly by Non-Hindus.
Again, there is no solution - only ways to cope with these situations!

Pranaam,
Sarasvati