And yes, for fractals I used a lot a little free software called " Chaoscope ". It can generate some fractals and render them in a BMP file. After I put the renders into photoshop to create some new shapes !
For the fractals shapes I often use a little very interesting software, it is Chaoscope. It is free and you can generate fractals shapes easily with a lot of presets. After the fractal rendering you've got a jpeg or bmp picture then you put it in photoshop and you can create custom brushes !!! It works well and it is something original.