You could always have a go at making your own. It's not as hard as you might think if you have a graphics editing program such as GImp or Photoshop. Just find the diffuse jpg in the texture folder. Open it up and create a new layer and paint in white the area's you want to be seen. Create a new black layer behind this and save as a new image. Add the image to the Opacity/transparency channel in DS and your away. If you want to have a go I am happy to offer any help you might need.