Is there a painless method for using the first page of a PDF as its alias icon in OS X? The operating system does this for PDF documents on the desktop, and I'd like to replicate the behavior for aliases. I have many PDF books stored in my Dropbox, and I have aliases to those that I'm currently reading on my desktop. Having icons associated with the aliases would make it much easier to differentiate between books without having to read many titles.
Can this be done without manually creating an icon from the PDF page?