Is there a utility to generate an icon from a spice subcircuit definition?
I think there is a script that will help you. It is called spice_icon_creator. Add the following line to your .suerc file:
[NOTE: this should all be on one line]
Then when you bring up SUE, you should see "Spice Icon Creator" under the local menu. When you run it, you may have to change the "Selection pattern" when using find. I don't know why it is set to "*.inc" instead of "*.sp" or something more appropriate.