Try either the Google Drive (https://drive.google.com/drive/folders/0B2ozCEidtWh3aVFlMG4tNU56RXM?fref=gc&dti=628061113896314) or...
Go to a matrix or mega tree, and go to the faces settings for that, add a face and select matrix. You'll see a "Download Images" button that opens a window where you can download 250+ different faces... all of which are also at the above link, but this way is much easier.