Unique Online Avatar Needed

I am joining the social media world and I want an avatar / icon that people will remember and it must be unique. I have no idea what it will be, I guess if I see it, I will just know.

Accepted File Formats: Standard Web Formats (.jpg, .gif or .png); Vector Formats (.eps, .pdf or .ai) It is tough to give design hints for this project... my background is largely real estate and vacation rentals...I like many colors, I am aggressive....most important thing designer must create is that design will be instaly identifiable by others...so complex designs probalby are not so good, or designs like anime that many people use are not so good.  Could be an image, or a caricature or a sign...   

Every design category has flexible pricing for all budgets.