The certificate content should fit on one side of a letter-sized, landscape-oriented sheet of paper.
The designer can be creative about the copy that appears on the certificate. It should leave room for an author name and a poem title to be inserted. The text might read something like this: "This award recognizes that <name> is one of ten winners of the 2014-2015 RhymeZone Poetry Prize for <title>"
The RhymeZone logo (attached) should be featured on the certificate, as well as the date the award will be announced (March 1, 2015). Other than that, the designer should feel free to include any other artwork and styling they feel is relevant. The theme of this year's contest is "Understanding", so that might be worked into the certificate somehow.