I have lots of images I need to display in a PDF (no text). I was hoping to make something like a contact sheet used for photos. Is there an easy way of doing this without having to do it all manually, i.e. can I set up, say, a 20 by 10 grid and then just list the filenames? If I have to go through and begin and end environments every few lines it's going to take way too long. Ideally, I'd like it to wrap onto the next page.