I think that it makes a lot of sense; they use these panels to decorate their retail location, and what better way than with collages of their product (the rights to which they pay for, end of story; it’s theirs) put to paint?

Disclosure: I own a retail art panel.

While I understand your point of view, I really don’t think it’s any more fair to hate on Joe than it would be to hate on Warhol for painting Campbell’s soup cans.

Would you also not have them show a collage of the designs on the home page anywhere? Maybe we shouldn’t be able to see the designs before we purchase them at all. The point is, they pay for the art and the license includes this usage. It’s not an “appropriation”, as they are very forthcoming with that and an artist doesn’t have to agree to their terms at all.