Take a look at the existing fractal explorer in <Filters>-<Render>-<Pattern>.
I think this basically does what you want.  It doesn't support arbitrary
functions (I bet you could code in your own if you really wanted to), but
has quite a few options, and I imagine it could produce (with help from
the rest of the gimp) any of the images UltraFractal can make.  The author
has a quick tutorial here:
(it's for an older version, but it still helps).
-James Smaby

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