There are few design challenges I find more viscerally appealing than brand design. Every project is totally unique and presents a drastically different set of challenges, constraints, and goals than those previous. And although I love digital interaction design, I greatly bemoan the slow demise of the business card as the essential expression of a brand.
A few years after creating the brand design for The Manly-Man Handyman, the proprietor was able to sell the business for roughly $50,000 due, in his words, almost exclusively to the recognition my design created in the area. All told, it served as a 9900% ROI on his investment.