Create Texture for Penicillium Mold

[zhrocks11]

Texture for mold, Im thinking a Petri Dish style texture with discoloration inside, something like below photos

https://i.pinimg.com/originals/65/a7/1e/65a71e25137399582d64571fb2c136d0.jpg

https://media.sciencephoto.com/image/c0248559/800wm

https://cloud.glstock.com/65605/2062708/8130885.jpg