When I first got into this hobby, I was using Vixen and wanted to learn how to create my own custom faces.  At that time Vixen did not have the best tools or tutorials on how to create them.  I managed to create 4 custom faces for my first pixel tree.  The next year I evolved to xLights and discovered how faces were implemented in this amazing software.  I downloaded some faces from xLights but was disappointed on how some of them were implemented.  Some face pictures were off by a pixel and would make the face look jerky during animation.  Other faces did not have transparency implemented, so you could not use background colors or animations.  There are plenty of online vendors that offer props, pixels, sequences, etc.; but there is no store that specializes in Faces.