So it's kind of like a motivational poster? Do you also like colourful art or should designers stick to your favourite/preferred colours?

What size did you have in mind?

Yes. Kind of like a motivational poster. I like colorful art. It just needs to be more like "art" and less like a "poster" so it can go in an executive office.

I'm flexible on size but was thinking 11x14 or 11x17. Vertical or horizontal - either is fine.