A face, of any sort (male, female, young, old, any race)
Around their face, circulate it with items (e.g. a car, a sport, a logo)
by doing so you create this character.

or better yet, do that but with someone you know, and the closer the item is to their face the more it means to them.

and i guess if you run out of items do some simple patterns of swirls/circles/anything

....perhaps using pastels? (I don't know, I love the way it fades)