To customize the cover art for your at-home viewing experience follow these steps:
Step 1.) Click the Share with Families at-home button in your Playlist Manager
Step 2.) Click upload to add new cover art to your playlist
We recommend that cover artwork be 16X9. We support jpegs and png files for the cover artwork.
Also, we've found that simple cover artwork with logos and colors work the best. Here is an example: