Here’s an excellent and eye catching promotion from Malaysia. Look closely at the packs of Kiwi fruit and you will see there is something not quite right about one of them.
Zespri Kiwi Fruit decided to place a promotional bag in the shape of a kiwi fruit as an in-pack promotion. This serves to attract more customers to have a double take when walking past the fruit stall and encourages them to make an impulse purchase.
By partly obscuring / camouflaging the gift you are greatly increasing the novelty factor. The gift looks as if it should be there.
See some other recommendations from Zespri on increasing sales.
Some more blogs below.