I think you don't understand the physics of the process in the plate video. The material is irrelevant. If you're inducing vibrational nodes in an object, where those nodes occur will are a function of 1) the fundamental frequency of the pure tone, and 2) the shape of the object. If you supply it with a sound that is more than one frequency, it is highly unlikely you will see anything, and even if you do, the overall shape of the pattern has a larger "shape of the object" character than "shape of the frequency" character.

If the plate is a circle, the vibrational nodes that you will see will 100% be circular and "totally boring". If, however, the shape is a rounded rectangle, you might see "something interesting", but that's cheating, because the the interesting shapes have to do with the fact that your plate is a rounded rectangle and not to do with the actual components of the sound that you're putting in.