Forget about the standard thank you notes and blank cards at your local store. Send something that is unforgettable and packs a punch in the personality department. I am in love with hand made cards by YoungandWithIt. Some of my favorites feature the Chicken Butt (seen here: Chicken Butt Cards). Perfect for just about any occasion and always bring a smile to my face.
(I also love their birthday gnomes.)
Two of my big criteria for cards: heavyweight/nice paper and be unique. I like for them to have a nice feel and a great look-- these definitely fit both of my criteria! And with artwork like this, it will be stuck on someones fridge or on a shelf in a cube for days to come!
Check out more at their shop: http://youngandwithit.etsy.com
