Bill Zebub is able to get you full color t-shirts.  The available shirts are usually listed in each movie page, but there are some designs that go beyond the movies.  

Write to bill (at) billzebub (dot) com for more information.  Shirts are usually $20, postage included in the price.

Wearing a shirt at a horror convention or a concert is a good place to get conversations started, but you can wear them in public.  They are legal, except for the ones that have nudity, which are meant more as trophies, or garments for private environments.  

Email bill@billzebub.com to get your collection started.