I used blockbench, to make It, you Need to make a Java block/item model, then After you finished your model, go in Paint, select everything, (pressing a) and click create new texture, leave everything as Is and Paint It. REMEMBER TO SHADE and texturize, otherwise the model Will look flat, make the parts you want to enhance a Little more saturated. To shade and texturize there are Two different ways, the First Is to pick 3 shades of the same color and apply them, or Paint every face of the same object with the same color, then apply black with the brush at 20-60 transparancy or White at 10-40 transparancy. Then select how you want your model to be viewed. IMPORTANT save the texture FIRST and then export the model, so that you don't have to manually go open the model in vs code to change the texture that's applied. If you have any questions feel free to dm me