I was asked today how you might make a bullet list in Thesis with images instead of standard bullets today. It depends on the bullet image you want to use. Mine was a 16px x 16px image. You have to play around with line-height and padding CSS values to get it to look right. And those values will be dependent on the size of your bullet image and your text.
Here is my bullet list :
Example of an Unordered Bullet List
Here is the HTML that goes in the post
Here is the CSS that you add to custom.css