want random image(s) block and control of style

I'm using the random image block in an iframe, and the document being viewed in the iframe always has the (default?) 8px margin on the body tag.

I would like to get complete control of the styles of the random image block, especially I would like to eliminate the body margin. What would be the best way to achieve this?

Ideally I'd like a random image block that would display a random image or multiple images, thumbnail size, from within a particular album (and its sub-albums) and allow me to pass it a style.