In California we have the STAR test. A couple of years ago I found some star-shaped pearlescent glass 'stones' like the ones used to decorate gardens, aquariums, or vases. I gave one to each of my students, letting them know that they were already 'stars' because they had worked hard all school year to get ready for this test.
I explained that this star had no magical powers and wouldn't make them smarter or give them luck, but it represented all the time and energy they had put into their learning. They could leave it on their desks or hold on to it to remind them to believe in themselves, to 'trust their brains', and not to let themselves give up... because this was their time to 'shine like the stars'!
There was a thread on a similar topic a couple of weeks ago:
http://proteacher.net/discussions/sh...ad.php?t=32122