Banner Images of Web Sites

In working with WordPress I have figured out how to make a custom image appear in the banner for each blog. They are screen shots of the sites I have built and they appear on the individual blog pages, not the blog home page where the newest blogs are summarized and a random selection of 5 images fills the banner location. Currently I have some 5 different melting ice photos for that use. With the speed of melt on these record high warm days, I better come up with a new set soon!