My favourites are the yellow-purple one (top row, fourth from left) which reminds me of a fractal or particle trails in the detector of a collider and numbers 3, 5 and 6 in the bottom row which look very dynamic to me. I'll add the top left one for its herbal look.

Cheers!
Markus







anyway, keep us updated and post what you learned and so on
So I decided to make some free ones from the beginning.