How do I style a select dropdown with only CSS

Question

Is it possible to style a choose> dropdown using simply CSS?

Without using any JavaScript, I need to style a select form as much as humanly can. What CSS attributes can I use to do this?

This code must work with all popular browsers:

Web Explorer versions 6, 7, and 8
Firefox Safari I'm confident I can succeed using JavaScript:

And I'm not referring to basic styling. What can we achieve with CSS alone that is the best?

I discovered related queries on Stack Overflow.

Also on Doctype.com is this one.