When I was in the post office last week I found this booklet on stamp collecting that holds images of various postage stamps issued in the U.S. They are perfect for collage work! You can cut them out and use them as is -- or you can copy them and use them again and again. This booklet I picked up several years ago. I don' know if it's still available, but it's the reason I keep my eye open when I go into the post office. What a great source of military stamps. I have used these stamp images many times in collage work. I cut out some of my favorites and made a sheet of them and then photocopied it.