Wasn't a fan of how small a screen all the gba bezels/overlays seemed to want me to have. It might be pixel perfect or w/e I dunno and I'm just a scrub, but I wasn't a fan. So I repurposed a wallpaper I found on google images. It's about as basic as you could expect from a bezel. Used mGBA in retroarch, all default settings except Integer Scaling turned ON.
Oh I forgot to add, it's for a 1920x1080 display.