To my eye, many of the covers of Science are artful, some even stunning. I am in the process of assembling about 20 of the covers of a given year from 2000 on. These are organized by year can be displayed individually. For each cover, there is a link to the contents page of that Science issue, which provides a short description of the cover and information on the source of the illustration. The information includes a link the first page of the article related to the cover where there is an abstract of the research paper.
The covers of the many Project Physics publications are of a different character than those of Science. Rather than referring to a particular research article, they depict the contents of an entire document. Black and white photos of objects or events that are immediately identifiable, the covers were nevertheless selected with aesthetic values as well as conceptual ones.