I've made a small, web-based
fractal flame generator, loosely based on Scott Drave's
algorithm. You can check it out
here. It works on the latest versions of Internet Explorer, Chrome, Firefox and Opera.
To generate a fractal, click near the center of the page and wait a couple of seconds. By default you'll get a Sierpinski triangle colored in red, green and blue.
To change some of the various settings, click on the gears icon in the top-left corner of the screen to open the menu. Then you can use the tree menu on the left to access different categories, and the options which you can modify will appear on the right.
Here are some examples of what it can generate (click on the thumbnails for larger versions):



