Nothing is less appealing that asking a team to design an email unsubscribe page. On the design heirachy of love, this page is somewhere down the bottom with the Terms of Service page. But it's these pages with the least appeal offers the greatest opportunity to delight users. It's unexpected. Take the case of the Groupon unsubscribe page. Take a couple of minutes to unsubscribe from Groupon (you can resubscribe with one click).
When you get to the landing page, you'll see a short movie on Derrick, the guy who thought you'd like to receive the daily Groupon.. clever, short, entertaining..