Here's a great piece of Toy Story and Firefly t-shirt mash-up art created by OneShoeOff called To Serenity and Beyond. As you can see, Woody is Captain Malcolm 'Mal' Reynolds and Buzz is Jayne Cobb. Here's what the artist had to say about the design:
Well, in the film you’ve got a space ranger and a cowboy, and then in tv show you’ve got the ultimate space cowboys. It was a match made in the Gamma Quadrant.
What do you think of the mash-up design?