Autogenerated icons suck.
I should know, I spent awhile implementing them (lots of copy-pasted sort of code) and they still don't look that good.

If someone can do something better with scripting, I _might_ end up replacing the current effect with the C++ equivelant, if I get the time. But I would recommend a do-it-yourself approach for the time being, if it's feasible, either using Nuke's suggestion of scripting or ones cooked up by an artist.
All this is IMHO, of course, they may just be what you're looking for. They're toggleable via a ship-flag; it should be in the wiki, if not, PM me and I'll dig it up.