As packaging for Orms Pro Photo Warehouse, I've done multiple camera illustrations that's been used in their retail department, printed on various sized brown paper bags to add a fun touch to their packaging.  Some of these were also printed on cotton shopper bags, which in return supported a charity that constructed the bags.

Without even considering it as a marketing exercise, these naturally encouraged people to share photos of their purchases and illustrated bags, creating positive brand awareness.

Above: I came up with a little hashtag 'shoot what you see' that we also used on the bags as a tagline.