I happened to see this design (horse shape) in pixabay and I liked it a lot. I thought about how to do it in gimp and it isn't really hard to do but you have to have a little patience.
Thanks to the person who came up with this novel design, at least for me.

This is with black background.

Wow, Issabella. Very impressive. Maybe someone here can automate this (you know already I'm a lazy filter guy). lol

Thanks for sharing.

Lyle, thank you so much.
I did explanations about how I did it. just in case someone can do it as you say.

Issa: Really like the effect against black - you were right, very eye-catching indeed.

Interesting manipulation of an image.
No time currently to even attempt it, sorry.

Thank you so much Skinnyhouse and Dinasset for your comments.

Thank you for the tutorial, Issa. No filter needed for me, you know I like 'hand made'

Ella, GREAT!!!! I love your result made by hand even better.