Understanding how fluids move through underground rocks is important for fields like energy production, water storage, and environmental cleanup. However, getting detailed images of these rocks is difficult, expensive, and sometimes impossible. To solve this, we created a new computer-based method to generate realistic rock images that look and behave like the real thing. Our approach uses a step-by-step process that carefully mimics how natural rock structures form, while also keeping important physical features like how much empty space (porosity) they contain. We tested the method by comparing the fake images to real ones and found that they match well in both shape and internal structure. This means we can now create large sets of realistic rock images to help scientists study underground systems more effectively and at a lower cost.