If you didn't fully explore my Dispensary of Everything then you probably missed my Network Encounter cards.
https://www.dropbox.com/sh/zi9wq9eoffn47pk/AABbhbLF19sJW1WxJtRu2G8Ta?dl=0&lst=
These are card images for ice, ice breakers, and a good handful of possible sub-systems. You can print them yourself, but they are really intended to be use with a print-on-demand service. The included ReadMe.txt contains more information on printing.
If you have additional ideas on sub-systems, please let me know.