Tricks you can play with an image:

Adjust saturation, brightness, contrast, hue, adjust the color matrix, and more.

Blur your picture in different ways.

Distort images using Twirl, Bump, Pinch, and other effects.

Stylize your art: Make Mosaic, Crystalize, use Halftone effects, etc.

Use combinations of several Mac OS X filters called Quartz Compositions.

Blend your photos into one creative artwork using so-called Overlap effects.

Transform your images by changing their shape and perspective.

Tile, kaleidoscope, and crop images.

Add photo frames, borders, or border masks.

Image Generating:

Special mathematical algorithms to create original images.

Handy set of controls for each generator.

Render function allows to arrange objects in random order.

Ability to set colors of a generated image.