For significantly less compute you could make pretty good coloring book pages just using different edge detection methods or simply using the stamp filter in Photoshop.
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I wouldn't call simple edge detection "pretty good" colouring book generation. You're just gonna get all the edges of complex shapes; it needs to be cartoonified/simplified with having large contiguous patches of colour in mind.
I actually used this exact method in the early 2000s to make "coloring books" for local businesses using their own photographs. They would give them out and use them for marketing.