Here is a screen grab of the file in Adobe Illustrator:
Based on an antique victorian heating register, only really tiny. I took pictures of the actual register which belongs to my friend Tim Siftar from his old house in West Philadelphia, then I painstakingly traced the outlines using Adobe Illustrator to get something that could be brought into the 3D modeling software (Blender in this case) and extruded and have a ring put on top of it. Then it was ready to be printed and cast.