Hold a brightly-colored magic wand (with gold tips) in your hand, and use it during your show. Either point at an object, or wave it in the air -- whatever looks magical to enhance the moment.
Suddenly, the wand changes from being brightly colored to being a black wand with golden tips. Where did the color go? It's magic!
Your audience will be stunned by this amazing color change, instantly conveying that you are, indeed, a real magician!