Have you guys heard about Martha Stewart's new punches? You can buy a separate piece that makes it possible for you to punch matching corners. Pretty cool. The low-down is below along with a link to the MS website so you can see all the different ones and below that is a link to an instruction sheet for download.
Loop Edge Punch - Punch Around the Page
Use this loop edge punch with the matching corner punch (sold separately) to achieve on continuous design around all four sides of a craft project.
This edge punch can also be used alone to create a design along an edge. Whether used alone or with the matching corner punch (sold separately), this design makes for great decorative borders for cards, photo mats, scrapbook pages, and craft projects.
This edge punch features foldable wings for convenient storage in standing position.
Click HERE to go to the MS website.
Click HERE to download your own copy of this handy dandy file.