I got some new swim trunks for Christmas made by Reef, a brand that does lots of surfing apparel and accessories. Instead of a regular cardboard tag, they came with this cool plastic tag with a guitar pick built into it. While not every surfer is a guitarist, this is still a great way to turn something that would be thrown out into a cool promo that basically cost them nothing. The moral of the story: if you have the opportunity to take a piece of throwaway packaging and turn it into a promo that is relevant to your audience, take it. Although my sample size is one, I play guitar a lot more than I swim, so the guitar pick is probably going to remind me of their brand even more than the actual swim trunks.