Don't mean to poop on your party, Monkeyrum, but I'm curious about the copyright status. Many members of this forum have legitimate concerns regarding copyright protection for their designs, yet those same concerns might seem to prohibit your use of a design from the movie. On the other hand, several models of the Toy Story characters already are available -- and even the models available at The Disney experience come from people outside the Disney organization. Using your model only at the party probably does not involve any hassle for you. But if you plan to release it to other modelers, might it be wise to change the coloring and logos enough to make it your own?
All progress is change, but not all change is progress.