Demo video of custom-built frames for SFM I created containing ponies. :D  Contains 3 frame colors (wood, white, and black) and 3 sizes (standard, square and wide).  Each frame has skin groups that can be changed to provide extra pictures. The pictures and frames swapping in the video do not happen automatically; it was just done to show all the sets.  The pictures can be modified if wanted (though may require a bit of knowledge on Source modding).  This does mean they don't "have" to contain ponies, but why?

They can be downloaded here:
http://argodaemon.deviantart.com/art/MLP-Frames-w-Download-SFM-Resource-364610186

Now back to animating ponies. ^^