About T-Shirt Design
If you like shirts that actually have some personality, Vampire Pumpkin Emoticon T-Shirt is a good example. It fits really well with Halloween, but you do not have to be obsessed with that stuff to enjoy the joke.
You could wear it for Halloween, bring it out for October events, or just keep it in the normal shirt rotation. It fits nicely with novelty t shirts that are meant to be fun first and serious never.
This is the kind of idea that works well on novelty shirts because you can understand it right away. It is an easy design to wear when you want something a little more fun than a plain shirt.