Icon improvements

I’m using the icon to show a thumbnail of a PDF – basically I grab a screen shot of the front page and shrink it to about 250px high. It works well, but it’s hard to tell which thumbnail is which! http://www.abiquo.com/white-papers-research/

I’d love to hover over the icon in the package page and have it pop up a larger image, or to show the icon name as a tool tip.