Blues: Knowledge, trust, calm and honesty.
Dark neutrals: Formality, mystery, exclusivity and luxury.
Light neutrals: Purity, balance and sophistication.
To give us an idea of the overall feeling of your brand, let us know which styles you lean towards
The optometrist, Elisabeth, is seeking a creative design in theory that plays on the Eye chart. https://en.wikipedia.org/wiki/Eye_chart
However to me, the person running the contest, I feel like that's a really bad idea in practice. Do something creative, be mindful of people who are color blind, and not too generic.