I don't do this, but I have a good idea for quickly creating a "scene"
around the object you are testing:

  Make some scene which looks good and is sufficiently complex (could have,
for example, a landscape, sky, clouds and so on). It doesn't matter how much
it takes to render. Just make it look good.
  Then put the camera at the origin. Avoid putting any object close to the
camera. Make the camera spherical with an angle of 360 degrees and render
at some feasible resolution (this makes a spherical projection of the scene
as the image). It's not necessary to make the image really big.
  Now when you want to test your reflective object, put this image as
sky_sphere pigment with map_type 1 (ie spherical mapping).

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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