2) Toast with texture background

/emberstextapi sendcustom @a {textureBackground:{texture:"modid:textures/gui/panel.png",mode:"STRETCH",paddingX:6,paddingY:4},wrap:160} 120 "Updates available"

Tips: - Use mode:"CROP" to keep pixel density when resizing. - Tiling panels? Set mode:"TILE" and tweak scaleX/scaleY.