Here are the NES Black Box bezels I created for Retroarch. There are three sets for 3 different configurations: NoTV, TV, and ThickTV.
Download and unzip to your RetroArch\overlays folder. Set them up through Retroarch.
You can also download the playlist and playlist clear logo here:
Also, @CTRL-ALT-DEFEAT generously made an awesome theme video to go along with the playlist and bezels. Download it here: