I think he mean a tool to generate the images that are needed to create footers. My tool dose this for GBA, it would be easy to add support for GB/C and NES, but I don't know if there is a demand for this or not. There might be a tool already out there that makes the footers for those systems that uses PNG images.A gb/gbc/nes tool would need to include copyrighted GB/GBC/NES banners (I think Riku's tool actually does include a copyrighted empty gba ambassador game banner ) and would require considerably more efforts than generating two PNG images. And besides, you need to unpack the whole GB/GBC/NES NCCH to replace the ROM in the romfs... so at that point, you can as well edit the banner.