/3/ - 3DCG

>>964911
Like this? The blue background can be replaced with any other texture you wanted, by plugging something into the "A" input of the mix color node (where that blue swatch is currently).

If you wanted the blue/background to be transparent instead, you'd just take the color output from the color ramp and plug it into the alpha input of the Principled BSDF node (making sure to turn on transparency in the material settings for eevee). You'd also just plug your texture into the base color socket of the Principled as well, getting rid of that mix color node entirely.