Edenpics is a Web resources that offers 144 nature wallpapers / pictures. These are available in various sizes to fit your screen resolution. They are free to download and print under certain conditions. Many of them include a scripture verse. They therefore make very nice scripture verses posters.
The image on the left is the one I have chosen to place as a wallpaper on my computer screen. Click on it to see a larger version. It contains a verse from the second reading for Mass tomorrow.
Other scripture verse posters are also available on the 4CatholicEducator.com Web site at http://www.4catholiceducators.com/bible_posters_archive.htm