Fractal art is traditionally different from regular illustrations. They can be both vector or pixel but usually special programs are needed to create them. The programs are based mathematical formulations and variations. Mathematicians creates the basis of the simple elements and the designers changes only parameters to get artistic result.
Fractals are sometimes most important part of a design. Nowadays they are widely used even by the biggest product releases and campaigns.
Some softwares that you can use, real long and useful list: link
Here are some examples of digital fractal art on Dreamstime:
Love fractals! Got hooked on them within the last year and have been trying to play around with different programs. There is some GREAT fractal work out there for sure. I have had a little luck with some of my fractals on microstock.
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