Stable diffusion has a really cool tool called sd upscale that will rescale an image using an ai, then breaks an image up into tiles and runs img2img on those smaller tiles. This allows you to upscale well beyond any limits you have in memory. The only tradeoff is that each time you double the size of an image, it takes 4 times longer to double another time.
You can find this option by going to the img2img tab in automatic1111, click on scripts at the bottom of the page and select sd upscale.
You want to set the cfg scale and sampling steps high, and set the denoise strength low. Change your prompt to just "highly detailed." Play with this to get the effect you want.
By setting the denise strength a little higher and using a prompt like leaf for an image of leaves you can create an image of a leaf made up of tiles of little leaves.
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