Overlays for Knulli

Hello everyone. Happy upcoming 12:00... I have downloaded a lotta bezels or overlays none of it works on knulli. Only works the ones Metro Game Corps' favorites, which are terrible. I grew up on NES, but I don't want to use outdated crappy screen effect for nostalgia sake. Does anyone know how to get only border overlays without messing up my view? P. S. Does this decorations section in settings work at all on knulli? I followed every instructions. Or should I change to MuOS?