I wanted, but never got around to, creating a mod that accepts some kind of data outside the game (lines of text, JSON objects, packets from the TUN driver, whatever), wraps them up as Factorio objects, and plops them onto a belt, and another that reads them and sends them back out.

The idea being that this could be (A) a cool hack (belt speed factoring into ping time, lmao), but (B) a way to visualize data flow in complex queue systems.