Aldaron: I tried volumetric spheres, stretched out in various ways and got so-so results. I'll try to post what I have done so far. If you (or anyone) can do it, there's a box of REAL 3D holograms and Motion-Pix with your name on it. :)

pedrith: What you suggested sounds interesting (and I have split the R G B into seperate images to use as texture maps), but as for the rest I'm at a loss. I mean I sort of understand what your saying and might take a stab at it in Bryce, but my Brycing is a little rusty now.

Thanks, both.
-Tim