Each year, the teachers at Hershey Elementary provide an excellent example of what can be done to excite young minds towards astronomy.
In addition to the posters and presentations, they make some t-shirts using glow-in-the-dark fabric paint. The t-shirts change from plain black to showing one of the constellations of the night.
In addition to the normal classwork, the classes have a starry night where the kids get to show their parents what they have done in class.
I particularly like the effect with the lights out!