I'm not usually a fan of logos, but this chickadee saying "Hey" is cute enough to stand on its own even if you've never heard of heychickadee.com.
No joke, I used to do cross stitch with my mom while listening to a ghetto blaster. Someone stole a scrap of my childhood and made me a shirt!
Available at: Sick For Cute http://www.sickforcute.com/shop/product/373/BadStomachLadiesShirt?csrc=ladiestees ($16)
Available at: Death and Taxes http://www.cafepress.com/DeathandTaxes.460429737 ($23)
Why I never! The gall!
Available at: Ex-Boyfriend Collection http://www.ex-boyfriendcollection.com/shop/tshirt-d-45-p-0-FuzzAldrinTshirt.htm ($25)