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"I made a fork of a curl noise shadertoy here which shows a mix of large scale and small scale curls: https://www.shadertoy.com/view/XfS3R3 This is achieved by modifying the layered noise function so it primarily adds high frequencies where the lower frequencies are neutral."
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"Here’s an idea - have 2 octaves of curl noise, but don’t add them. Instead linearly interpolate between them based on a third noise (probably Perlin/simplex)."
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There are some interesting ideas in this thread: https://old.reddit.com/r/proceduralgeneration/comments/18y4wco/curl_noise_how_to_get_multiscale_vortices_and_my/
Particularly:
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