Help rendering a seamless/tile-able 2D fractal noise?

[IndyE]

Hi all, sorry but I'm going to forgo the introduction thread since I'm basically new to fractals.

In short I'm looking to render a seamless/tile-able 2D high-res (3000x3000+ pixel) raster of some fractal noise for a digital camouflage project I'm doing; I remember seeing a lot of stuff like what I'm looking for done during the early 1990's but I'm unsure what software to start with and how I'd get the result I'm trying to achieve. The fractal noise(s) itself is not an end but rather a means to an end for the project; so it's important that i can export it to Photoshop/GIMP/Inkscape/etc in a lossless raster or vector format.

I'm actually wanting to render something nearly identical to this:

Image is from http://xanadu-fx.com/tiles/fractals.php

Any help would be greatly appreciated, thanks all!

[cKleinhuis]

my program "mutatorkammer" has a checkbox for making any of its generated images tileable, its an abandoned project, but it can do this

if you download it, open the "options" tab and check "seamless tileable" then every generated image is seamless tileable, you can try using the breed method to find an image that suits your need,
i have just a slight idea how i did it, it just copied parts from the outer to the inner, but im afraid i can not provide you with an algorithm

[IndyE]

Downloaded MutatorKammer_v0694, This looks really neat and user friendly cKleinhuis. It might take me awhile to create something I can use with it, so I'm open to more suggestions if anyone else has some.

[EDIT] Unfortunately after A day of using MutatorKammer I've concluded it's too unstable to actually use at the moment; looking forward to playing with it, but for the current task at hand it's not feasible for me.