Check out how World Wildlife Fund uses t-shirts, sweatshirts, plushies and other promo gifts as a reward for making a donation. They’ve been doing this for years, frequently sending email marketing campaigns like the one below. They always feature the cool logo’d items you get for making a donation of X, Y, or Z. They even theme it around holidays and specific species. Their offers are time-based, creating a sense of urgency amongst potential donors.

Non-profits are experts in getting people to take action. A small thank-you gift is all it takes. Next time you're trying to get money, time, or attention from your customers or donors, take a clue from WWF's brilliant marketing strategy. Here's the email I received:

World Wildlife Fund's Thank-You Gifts for Making a Donation