Here is a file I made for my mom. Hi Mom! This was created to mat a 5×7 photo, but would be useful at any (reasonable) size.
The download is a zip file with a single layer svg file for use with any version of SCAL and a DXF file.
My files are for personal use only. Feel free to link to this post, but the files are not to be shared or distributed in any way.
Download the files here.