Here's a set of 6 paper templates. They are all black. You can use them for several purposes - for example, place the template over a patterned background paper, then select the template, go to your paper layer, select inverse, clear/delete, and hide the template layer. You should then have a cutout of your paper in the shape of the template. See the 2nd preview below - that's exactly how I created those images.
You can also use these in layouts to add oomph to photo backs, or in making siggies online.
I used DP's excellent Circles & More brush set to create these templates. You may use them for personal or commercial use. If using for commercial use, please credit me in your TOU.
Download them here. Enjoy!